Did I creep her out?

it sounds like she likes you. Girls know that holding eye contact with a guy is a good way to show them you like them. She wasn't just being nice and you didn't creep her out. She sounds shy and the eye contact is probably her way to both try to figure out whether or not you like her back and to show you that she has an interest. Looking out of the corner of her eye at you is a good sign because it means she is looking at you and that she is trying to see if you are looking at her. Ask her out or if you are too shy and want her to make the move (no guarantees here), make it clear you are interested in her. Smile at her when you are making eye contact. Flirt with her. Compliment her. Oh yeah and as to how you guys didn't talk to each other the entire semester, its probably because she doesn't know you well enough to say anything to you.

This reminds me of my old crush. I was a freshman, wanted to get to know this guy so much but was so shy. So, for valentines day, I gave him a gift nothing much but also a note and card.
For the first week we smile at each other all the time but never ever spoke. We ran into each other all the time it seem like it was meant. Sophomore year came we act like nothing happen
say each other almost everyday , and would accidentally run into one another but nothing gave us the confidence. Everyone knew I liked him and he liked me to but his number never came my way. Now back to you, a girl wants a guy to ask her out because if she does it means she just have to deal with the consequences , rather if the answer is good or bad. She likes you just won't you to step up and do your thing.