Just keep talking to her. Don’t try to pretend like you’re not interested in her. Invite her to do something low-risk like studying together. Maybe eat together if there’s time. Eventually ask her out on a date, but don’t wait too long. It should only take a few times hanging out before she can tell whether she likes you enough to date you or not.
The reality here is, she’s either going to feel the same way about you or she’s not. If she doesn’t, then she’ll refuse to do anything with you that looks like a date. If that happens, then you need to find another young lady to focus your affections on. Don’t keep chasing after a girl that’s not interested in you. You can keep being her friend, but you have to keep it friendly. When you find another girl you like, ask her for advice instead of us.
But if she does like you, a few things to keep in mind when asking her out. Don’t try to pretend like it’s just another study date. You do not want her to be confused about what your intentions are. Dinner is the best thing to do on a first date, maybe follow up with drinks if you both do that. It doesn’t have to be fancy, but it does have to just be the two of you. If she doesn’t want to be alone with you then she doesn’t want to date you. Move on.
It’s hard to give specific advice on how to do this, but you want to slowly escalate affection. Introduce touch slowly and let her get used to you and comfortable. Don’t jump on her.