Your horse knows that she can do these things to you and get away with them. What do you do when she does them? Whatever it is, it is not making enough of an impressions on the horse so that the next time she tries something all you need to do is threaten .
Horses are very senisitive , and they know if you have the self confidence to make quick and memorable discipline., the quicker and more memorable the better.
Working on the ground with horses not only established your dominance and leadership BEFORE the push comes (I mean the horse pushing on you, by intruding on your space, biting or kicking), but it also brings you to thinking about them and wathcing them, too. The more you can be aware of when a kick or bite is what your horse is thinking about, so that you can interrupt it, the less it takes from you to derail this behavior and the more willingly your horse will accept such discipline without resentment.
However, to start with , the next time she tries to bite, I would take whatever is at hand and smack her really hard on the neck or should and yell! and make her think she is going to die; for just one or two seconds. It has to make a real impression. Then let her settle. Do NOT go back and apologize and lovey-dovey. Just do nothing and let her settle, then go right back to grooming as if nothing happened.