How do I go about this?

My brother never introduced his girlfriend and expected me to be all buddy buddy with her and the first time she ever came around she ignored my mother in-law when she told her that she was in my sons spot on our side by side and made her put him in the back and mind you we were pulling another vehicle with a tow strap and if the tow strap broke it could have either injured him badly or killed him! Then later on they hadn’t been dating even a month and were already talking marriage but my brother hadn’t been divorced for even 3 months and had three kids from previous marriage. And she sends me a nasty message telling me a sob story of her child hood and then telling me how my family functions were gonna go and how she was just going to let his family get to know her and now all she acts is completely snobby around me and all I ever hear her talk about is her health problems it’s like a constant poor me poor me poor me how would you go about making her feel uncomfortable so she quits treating me like this around my family? Or suggestions on what to do? As my parents flat out told me what she did to me was wrong and to make her uncomfortable by actually saying hi but I don’t even want to talk to her I hate drama so I just figured if I don’t say anything I’m better off I know she hates me my dad told me to make her feel uncomfortable just by saying hi but I don’t even want to what would you do if you were in my shoes??