Why Does A Girl Keep Coming Up To Me And Giving Me A Hug When I Don't Even Know Her?

There are three possible answers to that. The first is that she likes you. Second is that she wants to be friends. Third is that she's just trying to annoy you or freak you out. I think it's the first or second one. You should ask her. And also, does it annoy you or do you like it? If it annoys you, you should ask her why she does it and ask her to stop it (ask nicely) and if you like it (or her) then you should try becoming friends and get to know her better. She might start liking you too (if you liker her) so it depends on how you feel about it. Hope it helps!