The 10 days separation is to allow for an incubation period. Even if she seems health now, she could still be harboring something that has not developed into outward symptoms yet. It's also better to slowly introduce new cats to existing ones as well..
Thereof, how do you keep cats separated?
Separate your cats in different rooms for several days or weeks, with separate beds, bowls and litter boxes. This way they can hear and smell each other, but don't have to interact. Place the cats' food bowls on opposite sides of a closed door.
Secondly, how long should I keep my cat in one room? Do not plan any parties or loud goings-on for a while, either! On average, a new cat may stay in the Bonding Room for 2 - 7 days, but the cat will let you know when he is ready to explore further.
Correspondingly, how long should you isolate a new cat?
7 to 10 days
Will new cats eventually get along?
According to the ASPCA, it can take eight months to a year for cats to develop friendships. Some will learn to love each other, but you might have to face the reality that not all cats will get along.
Related Question Answers
Can cats kill each other?
So: the short answer to your question: cats, whether domestic or wild, are unlikely to fight “to the death” as long as they have a way to break off from the fight and get away. Cats that can't get away are in danger of being killed; as a cat owner, it's your job to keep that from happening.Should I let my cats play fight?
Play is fun, it is good exercise, it allows cats to be cats, and it should not be discouraged! If cats that normally play fight have a more 'aggressive episode', owners should never directly intervene – this may escalate the cat's anxiety and lead to increased aggression between the two cats or even towards the owner.How many cats is too many?
There is no magic number at which “how many” becomes “too many.” It's more like a magic threshold one crosses at which point life goes from being “feline-friendly” to “feline-unhealthy.” For some cat owners, “too many” means two cats. For others, it means nine.Do cats get jealous?
Just like some people, cats can become jealous when they feel they're being excluded or their environment has changed drastically or suddenly. The jealousy may be triggered by any number of events: Cats may show signs of jealousy when you pay more attention to an object, person, or another animal.What is the normal amount of hissing in introducing a cat?
Again, some hissing when they see each other is normal so don't be alarmed. Some light swatting is also common. Separate them if the hissing doesn't die down after 1 or 2 minutes or if there is any sign of threat (swatting with force, chasing, screaming, ears flattened, etc.). Try again when the cats seem to be calm.Why do cats knead?
Cats knead with their front paws, but nobody's sure why they do it. In adulthood, a cat supposedly will knead when it's feeling happy or content because it associates the motion with the comforts of nursing and its mother. Adding further weight to the explanation: Some cats even suckle on the surface they're kneading.Is it better to have two cats of the same gender?
You need to make sure the kittens get along with each other. If they are from the same litter, they probably will get along no matter what their gender. If they are from different litters, a male and a female is probably better unless they are very young. They don't care about gender or litter mates.Does feliway really work?
Yes, but does it really work? Just like each cat has their own personality, each cat may react differently, or not at all, to Feliway. It does not work for every cat or every behavior or anxiety problem. It also may not help much, if at all, if your cat's behavior change is due to a medical condition.Can I let my kitten roam the house?
Do not allow your cat to free-roam. Never allow a cat outside until it is thoroughly familiar and comfortable in your own home. This may take two to three months. Some adult cats will try to return to their old territory, usually unsuccessfully.Is it okay to keep a cat in one room?
Do not keep a cat in one room unless you take very good care of it and make sure it can move around, explore and get some exercise. That cat was never allowed into the other rooms in her house because her family was concerned that the cat would spray and stink up the house.Should I let my cat roam the house at night?
It's OK to put your cat alone in a room at night so long as your cat is OK with it. It's not just a matter of locking them in; you have to prepare the room, the cat, and yourself. You will need to take the time to acclimate them to this new living situation and make sure that they are never under undue stress.Will my cat come back if I let him outside?
Go outside and leave the door to the house open so that your cat is able to join you but can also quickly get back inside if they want. While you're outside you can also continue to train your cat to come when called. Make sure that you don't always take them back inside straight away when they're called.How long will a scared cat hide?
Often, your cat will hide for a day or two when introduced to a new home. Sometimes a traumatic experience—such as taking him to the veterinarian or bringing a new animal into the home—can disrupt her routine and send her under the bed for a few days.Where should I keep my kitten at night?
A secure and comfortable room like the laundry is ideal, or you might even want to consider a pen or large crate so that you can control your kitten's movements at night. Kittens love to be nice and cosy, so make sure there are lots of blankets, and that the bed has reasonably high sides to provide extra warmth.Should you ignore a crying kitten?
Unless you know for certain that your kitten wants something from you it can't have, avoid ignoring its needs. Your kitten may not have access to its litter or may be out of water. Likewise, don't scold your kitten for crying too much. It is not only not likely to stop it from crying, but may make it fear you.How much should u feed a cat?
Typically, dry food contains about 300 calories per cup, and canned food contains about 250 calories in each 6 oz can. (or, 125 per 3-ounce can). Using these counts as a guide, an 8-pound cat would need 4/5 of a cup of dry food or just less than a full 6-oz can (or two 3-ounce cans) of wet food per day.Should you leave lights on for cats?
No. Cats can see in the dark. Cats have fantastic night vision - they are quite nocturnal if left to their ow devices. It's completely unnecessary to leave a light on for your cat.How long should you keep a rescue cat indoors?
two weeks
Do cats like clean rooms?
Edited to add: Cats want a clean litter box, clean water, and fresh food. Beyond that, if you are a bit of a messy person, your cat won't mind. Just give them room to explore. Even if it's vertical room. 
