I agree with Daisy. It is up to you and how you want your novel to be. For myself, I really hate reading anything like that, and seeing anything like that in movies or on tv. It is just one of those things that gets to me andis upsetting. However, not everyone is like me. You just need tot think about how you want your novel to be. For example, if your novel is mainly focused on the abuse, I don't see why you wouldn't go into more detail...but if you are trying to get the readers to see something beyond or aside from that, and going into great detail during those moments might take away from that. Your choice really.