Is it normal to have fantasies about my female best friend turned enemy?

A girl I had been friends with for quite awhile ended our friendship after she broke up with her boyfriend whom I did not get along with and she continued to tear apart some of my other friends too. I used to respect as she was my closest friend, but she hurt me for no apparent reason.

Anyway, I have not fantasized about hurting her or anything, but I do have fantasies of her physically/sexually now that I never did before.

It feels as if she went from my closest friend to a sex slave that is only good for physical pleasures. Like I just can't respect her anymore.

Is it normal to think of someone you dislike for hurting you, in sexual ways?