I used to be an LPN (now an RN), and have worked in a facility (8 years) where I have had 60 patients. The place was NOT a SNF, though. Still, what you've posted sounds a bit insane.
I have also worked agency, and personally, I'd let the agency know exactly what the heck went on. Has the agency had trouble staffing this place in the past? Does the facility your roommate work at have a 'reputation' of being hard to staff? Just wondering right now.