There shouldn't be a problem, having had kittens here, one started to nurse from my lab who had puppies, and Cody has nursed from my cat after her kittens, the vet said it was fine. If they are very small then go ahead, if they are about 3-4 weeks give them some goats milk and dry food, human milk isn't very good for them, it can tear their bellies up. Yogurt would be good too. Also you will need to worm them and worm your little girl if she is licking them. Like pups, kittens usually have worms too. anything you need for the kittens just ask
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Mommy of Cody,Gracie,Bella,2labs,1cat, 2 skinkids
one Angel Baby Boy
8/8/09 I carried you under my heart for 20 weeks and will carry you in my heart forever