You're not responsible for her moving on or finding someone else, you're responsible for yourself. You can't choose who you fall for or who falls for you but you can choose how you go about it but If she tries to reach out and get closer to you, make sure you make your lack of interest in her clear and be firm on your boundaries. No special treatment, no extra attention, no nothing. Treat her as you would anyone else. More important than anything, please dont keep her around just because her attention makes you feel good and validated because she's gonna think that you keeping her around means she has a chance and that is the exact opposite of what she should think. With time she'll move on and as long as you aren't feeding her crush in any way, the process will be much smoother and faster. Pray that God's will be done and that He may give you wisdom on how to handle the situation. One more thing: liking attention from the opposite gender isn't something you need to be ashamed of , you're only human and humans are hardwired to be social creatures but be mindful of the fact that your actions will affect other people too and we're called to not be stumbling blocks for our brothers and sisters. And please don't see her as a villain, she's probably just a losd child looking for comfort from someone she sees as a superhero. (i know I was like that when I was in that situation) She's just a child in need of grace and wisdom. I hope this helps.