You need to come out and tell her like this "Fine you want treat me badly, don't worry Karma will get you"... If she says, what's that? Tell her "Something that gets bad people who hurts others"!
I have a girl who is very rude to me and very snobby. She thinks she's better than me, and I want to say something but I don't have the guts. How do I face her?
Just be the better person than her. Ignore her .
You need to be in a relationship with a person who respects and values you as a person