How can I just get through to this girl?

so i've liked this girl for about 2 months now and see her around campus a lot and we always say hi but we don't really know each other except from cl. i asked her if she'd like to get lunch sometime but because of midterms and break and my being away for a bit, i haven't had the chance to follow through. it's tough because sometimes when i see her she's with friends or it's not the most oportune moment...I JUST WANT TO TALK TO HER MORE AND WITHING A COUPLE WEEKS ASK HER ON A DATE