I hate my brothers girlfriend!?

I have 2 big brothers who i've always been close to and the younger one of my big brothers (hes 23) has recently started going out with this woman, at first I liked her but then my brother stopped coming to see me, my boyfriend and my other brother (who's 25) and then finally my other brother decided to talk to him about it, he confided that his new girlfriend doesn't like Bradley (my brother) because hes "skank", shes saying this because hes a mechanic and shes also said that she doesn't like me because Will (my brother) is too close to me and apparently its "creepy". By this she means once she invited herself round while me and my brother were having a play fight and laughing, hes my big brother for christ sake! Oh, and also apparently she doesn't like me because temporarily moving to India to do charity work (i've just finished uni), god knows why she doesn't like that its just "below" her. Finally, ever since we were little its been Will's dream to be a drama teacher and hes got a really good job doing just that and he was so happy and now his witch of a girlfriend is trying to make him quit and join her family buisness but Will won't say no because, to be honest, hes a push over. But what she doesn't get it Will is happy teaching drama! What can I do? I can't let her walk all over my brother like that and ruin his life?