Sounds like you’re already rooming with someone you don’t know. And she’s nice-- I’d be happy with that. If you’re compatible as roommates even if not best friends thank your lucky stars. Being friends is not instantaneous at any rate.
If the dorm is really bad talk to her about changing. I roomed with someone from HS and personally it worked great. We didn’t hang around together really because of our schedules but we did meet each others friends which really expanded both our circles.