On a serious note... if it's for a program that OSU doesn't offer... and something she's passionate about... not much you can do. Except realize that long distance relationships don't work and break it now rather than have one of you cheat on the other while separated. College will test any long distance relationship sorely.
If it's just because she's a fan or an idiot... break up with her immediately. You'll meet a lot of nice girls at OSU, one who hopefully has her priorities straight.
Either way, that relationship is doomed unless you can talk her out of it.