Goodbye books and stuffed animals

Faith struggles sometimes with making good choices. She likes to tease her brother by giving the dog his favorite teddies. Despite my best efforts to get her to stop and realize that it isn't funny, I was forced to let her feel how he feels by giving the dog her Lamby. After she still didn't get the point and told me that she was going to give the dog my cellphone and hoped that he ate it, she got a wake up call as she had her books and stuffed toys taken away for five days. This led to hitting me and screaming at me that she was going to spank my big fat butt. Words hurt and I think that she seen this as the tears rolled down my cheeks. I never have felt good about myself or had a good body image. Just something I've struggled with for a long time. I don't understand how my sweet little girl can change into this monster who doesn't care about the person she says she loves most. Maybe I'm reading into it too much and should just accept the fact that she was mad and we all say stuff when we are mad. I'm going to try to forget about it but I just really want to see a change in her.