Well if your looking for rejection run right up to her and ask her out?? But if you want to get to know her find a way that does not look like you are coming on to her and ask her why she dislikes everyone?? Odd she is
If you don't already talk to her, that's your first step. Establish a base with her so you don't scare her away.
Once you're comfortable enough, slip her the classic note "do you like me? Circle one" then proceed to add boxes "yes", "no" and "maybe". It may sound corny, but it comes off as very flirtatious and girls like that. Plus, the older you get, the more positive a response you will receive. Just make sure you actually know them first and you're in an environment that calls for quiet and/or good behavior. Otherwise you'll look like a creep. Good luck my dude.