Sounds like you might be over stimulating her. The best thing to do when she bites is to stop, say "NO!!" loudly and walk away. This should help to deter her from biting.

The best thing to do with kittens her age is to play with her using kitty toys, albeit teaser wand, stuffed mice, etc. Avoid using your hands as this encourages her to bite and she'll think it's a toy.

Hope this helps!!