My cat is biting its kittens

We have the mother cat in a cage since were gotten her weeks ago, for her to get used to the other animals my family has in the house.

She has had three kittens around 3 weeks ago. All of a sudden tonight she's just been meowing non stop, and will sometimes bite her kittens,
we cant separtate them because the kittens still need to nurse, but I cant have them hurt niether,

Please, if you know, help
Thank you..
-Jess

It's normal, it's her mothering them.

Her biting and roughing up the kitten is normal discipline. She is teaching the kitten limits and when enough is enough -- kittens don't know when to stop pestering and when they are biting too hard with those needle-sharp little teeth as they play.

Learning proper etiquette and limits is a very important part of growing up for a kitten, and your older cat is instinctively teaching the kitten, just as her own mother taught her. Don't worry about the occasional bouts of hissing and the kitten screaming like a child that has just been spanked. Don't interfere.