brush the cat now when she doesn't need it. be very careful and watch her body language. the minute she doesn't like it anymore;stop. try to stop while she's still enjoying it. Treats should follow a good brush session.
if she attacks you, even if she's right (because you pulled her hair), tell her no, but don't be harsh. When she's 10 or 12, at least then she won't have a bad attitude.