the guns "might go off on their own."

Hahahahaaaa. Wow. I have met people who believe that "Fully Automatic" means that they shoot without human intervention, like some robotic motion sensor equipped kill bot.

Unless no firearms is stipulated in the lease the landlord might have an issue evicting her. If I was her I'd leave after finals. Why the hell would you want to live with a bunch of liberal idiots. Although good luck in Massachusetts.

If you have roommates buy a keyed lock for your bedroom.