What should I do? Talk to her about it or not?

Ok so I'm dating this girl who doesn't drink or have . If we end up dating till we go back to college she will be a freshman and I will be a sophmore. But she thinks she wants to join a sorority but I'm not in a frat in fact I don't like frats. But I'm worried that if she does join one she won't have enough time for me because I know how much time it takes to be in one, or that she will start drinking alot and partying alot with frat guys and then not have anytime for me...so what should I do? Should I just not say anything to her about it? or talk to her about it once the time comes? I don't want her to think I'm trying to control her.