Do you think she has a fantasy?

Ok when me and my gf do it we usually have to be real quiet so we don't get caught. But when we can be as loud as we want she likes me to her and throw her around and pull her hair. She also likes to be called names. I umed she had a fantasy but when I asked she said no. I don't know if she said no because she thinks it weird or what. So I wanna ask her but I don't want her to be like ewww you wanna do that to me? And get mad ya know? So should I just ask? Or how can I ease it out of her. Btw she also likes light choking.