40km is not much. And what do you mean you can't drive over?

Anyway, if you want to talk to her stepmom, it's virtually impossible not to sound like you're interfering. Just interfere damn it, and if she doesn't listen, you could get your g/f to move in with you or something if you are very sure this relationship is heading down the right alley.

Sounds pretty extreme actually after I read it, haha.