That's a cool mom :3 She sounds like the kind that'd give you advice, much like my mom (who also gave me advice on how to work the Ouija board).
I think my dad would be the one to freak, since he comes from a very serious/strict family. 'Twas one of the reasons my mom divorced him. Then she met my stepdad online in a dating service, and they met at a Double-T Diner someplace in Maryland (I think).
But yeah. 'Course, it also depends on what grade of high school you're in, and when you first develop a relation. 'Cause you may both be in 12th grade and in the final month of school, but if you just started the relation then, it's unlikely that you'd wind up at the same college, must less wind up in colleges close to each other. However, if the both of you are in 9th grade and are somehow able to keep the relation for four years, you would probably end up together at the same college (or at least at nearby/sister colleges), though you would have to wait quite a bit. But yes, it is quite the loophole, and because you're considered an adult when you move on, you don't have to tell your parents if you don't want to.