Auracounts posted:

Another kitten would probably help this situation tremendously. You got your kitty when she was VERY young - 6 weeks is a tad early to take them away from their mother and littermates. The bigger problem, however, is that if she's an only cat, separated from other cats since 6 weeks, she never learned proper play.

Kittens attacks and play fight all the time. It's one of the ways in which they learn boundaries and the difference between biting and nibbling, or nipping. Same thing with the claws. When you watch two kittens fight, they will give out little distress cries if the other is playing too hard. I suspect yours simply never learned the difference - she IS playing, she just doesn't realize that she is hurting you.

Also, having a second will help mellow her out a bit too - she won't have to exert all her energy on you, because she now has a playmate to tire her out.

You could try making loud noises or cries when she bites/scratches/etc too hard to let her know that she has crossed the line. I'm sure others here will have suggestions, as well. It's hard for me to comment, because I've always gotten my kitties in pairs, so they've always learned fast how hard is too hard.

As far as whether being in heat affects her aggression, that I do not know. I do know it'll mellow her out in the sense that kitty rear end won't constantly be in your face with those low, constant, "IM IN HEAT" meows, so that's a plus. :P