Hey girl!
Yes, rush is definitely harder here as an upperclassman. It's not impossible to receive a bid, just harder. I've been told that juniors and seniors are not free here. (kinda sucks, but oh well.
) Be realistic and realize that you will be cut by some chapters, but don't let that get in your way of forming new friendships with girls in those chapters.
BUT... that being said -
RECRUITMENT IS FUN! Definitely go through. Just remember to be all about meeting people and making friends anywhere you go. BE OPEN to chapters you're not sure if you'd consider. Enjoy yourself, be at ease, be confident, and be GENUINE. I remember meeting girls in my rush group that were only nice to the groups they wanted to receive a bid from. They got cut right away, freshmen or no, because they were being obviously fake. Be prepared to love everyone, and DON'T listen to any stereotypes or negative opinions of chapters from anyone.
Like adpiucf said, make friends with sorority members now. But again, be genuine. Get your recs in order so that you have another edge.
One of my favorite groups during rush has accepted upperclassmen in the past. I didn't have the grades to go back.
Work on that GPA and things are much easier. The group that I pm'd you about has accepted upperclassmen. I know a few of the other groups have, but not sure which ones.
Honestly though, I wouldn't worry about which ones do. Go to each one and let your personality and accomplishments shine... enjoy EVERY chapter! Speaking from experience, there are spectacular girls in every chapter, and some of my best friends this year are girls I met during rush.
Oh BTW - we're holding recruitment right after and we do take upperclassmen...