How do I turn her down gently?

There’s a coworker that likes me. She really isn’t ugly (but I’m not lesbian or bi). I leave for college 2 hours away & she said that’s no problem, she’ll drive. I don’t know how to turn her down gently because I’ll feel bad 😪 It’s different when it’s a girl than a guy lol. Maybe because I’m emotional so I think they’re as emotional as me 😂 idk but help lol