I think you quit watching the videos/pictures, she cannot "make" you watch them, especially if you leave when her behavior gets too over the top. Maybe you set up a couple's counseling session and "make" her go with you to get another person's take on her behavior.

When/how did all this start? It sounds to me like she does not believe herself, has not "found" herself or she would not need to prove it so much? You have to be comfortable and enjoy the relationship or you cannot stay in it? If she won't see reason, you might have to make that choice.