Maybe the sticks you offered were too large or something. Can you offer straw or dry grasses of something? Maybe they just were not ready to build a nest. That is an important part of their nesting together. Building one.
Males will do that in trying to get her to go to the nest. If he is too aggressive and is actually hurting her, then I would separate them. Are they in an area where she can get away? They shouldn't be closed up in a small cage where she cannot get away from him if she needs to.