Well, I wish you luck and courage in your attempts. Don't worry, it might be a little weird after you ask her out (especially if she rejects you) but that won't last. I'm speaking from experience here, so yeah.
I'd suggest that you don't act timid or doubt yourself. Again, speaking from experience. This girl I liked from ages rejected me, then we became friends again, and I found out the only reason she rejected me was because I doubted myself too much and was a little too depressed. But I digress.
Some people might say ignore her and focus on your studies, but I know that if you really like her, that'll be almost impossible. So I'd say ask her sooner rather than later and avoid losing your chance to tell her how you feel.
Again, good luck and I hope fate smiles upon you.