What do I do about this girl?

We're both 14 and we are friends. She is Mary. But she likes to do this weird thing to me. She is kind of chubby and likes to wear jeans. One time we were working on a project in her room when she said that she had a tummy-ache. So she told me to rub her belly. While i'm doing this, she lifted up her leg so that my nose was in her butt and she ripped a HUGE fart in my face. She said "Whoa! That one was spicy!" After that, she would fart in my face every time I see her. One time when I was at her house, she was eating chinese food and she forced me to smell her "Gaseous Rippings" as she calls them. I really like her and I think everything about her is cool, her personality, her imagination, her ***, but I find her farting in my face really gross. What should I do?