Dear Reddit

I met this au pair girl back in February. And since then I cannot seem to get her outta my head. Just a brief background on our relationship. We have hang-out a few times (with other people) but never really gone out by ourselves. We always have fun and joke around with each other. We always text each other and ocassionally talk on Facebook chat. She is very religious and we share the same morals and values. All my friends say she isn't into me and I should move-on. And usually I would agree with that, but whenever I'm on dates with other girls this au pair girl is all I think about. And one of the reasons why I think she doesn't want to get involve with someone here is because her visa expires in June and she plans not to come back to the US any time soon.

So, I don't want to masquerade anymore and pretend that I'm not interested in her. I really want to ask her to be my girlfriend. Just to add we are both 25 and she is 10 months older than me. Reddit please advise me.

EDIT: should I ask her out or should I ask her to my girlfriend ?