Hope you found a good place for your mom.
We managed to take care of my grandmother at home, but it took a rotating team of 4 adults, plus occasional visits by extended family to give the 'regulars' breaks.
Others have described the ways to find a facility that is well staffed, where the food is good and the work gets done.
I have a friend who manages such facilities, and he routinely makes calls or goes in on weekends to replace no-show staff. He doesn't get much of a break, but the no-show on his schedule does not become a no-show for his residents.
Staff aren't usually paid well, so you have to go with your gut on which place has great caregivers while still being affordable for you.
The main thing I'd do, is after finding 2 or 3 options in the area that were decent and well-reviewed, I'd take my loved one to visit the top 3 and gauge their reaction. Even when the mind and words don't work, there's usually a level of emotional response.
The move will probably be upsetting (most moves are, for anyone), and staff may ask you not to visit at first to let them settle in. Call and get regular reports of how it's going, and start visiting as soon as they say it's OK. If your loved one doesn't settle in within a few weeks, look for reasons they might be troubled and see if there's anything you can do.
"I just want to go home" is a common sentiment, by the way; my grandmother said this once or twice even though she WAS in her own home. She thought it was odd too, on reflection.
Get the data, eliminate the obvious bad risks, and then go with your gut (and your loved one's gut).