I have no sympathy for a kid who removes smoke detectors and invites people over, especially now, to smoke anything. That girl is endangering the health of all and is BREAKING the law.
The college is obligated to ensure her safety. It’s a school-owned building. She should report it immediately and request an immediate move for health related reasons. Personally, as the parent, if they don’t take steps right away, I’d send a strongly worded email to make clear that if they don’t take action to get her out of there, you will not hesitate hire a lawyer.