Is my girlfriend joining a sorority going to ruin our relationship?

I know a lot of girls including my siser who rush sororities for good reason. They don't party all the time and actually want to help others with phylathropy. But I also know a lot of girls who completely changed upon rushing (Going out every night, fake friendships rubbing off on their personality, and countless one night stands with frat guys). I know they're extremely time consuming and as a pre med student I feel that would eliminate all extra time she was using on me. she's a very good girl and I really love her, but I dont know how to handle the situation. Help!
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