Is there any chance of finding a better nursing home, or might a board and care be suitable for her? I know in our area we found that the nursing homes were more expensive than board & care homes, and several nursing facilites had truly appallingly bad food.
If your mother could live in a board and care it COULD be better care and less expensive (if you find a good place) Finding one that will take Medicare might be the big issue, though if it is combined with her pension that might be enough.
I do know when we were looking for somewhere for my Grandmother we found an amazing boarding care that is fabulous, however we saw other places that were nightmares -- (bad part of town, bad lighting, uneven floors,tiny, dark rooms, unappealing food, etc.). At the one we chose, the food is great, the staff are caring and engaged, the house itself is beautiful inside (public spaces AND the residents rooms are nice colors, nicely furnished, big windows, ,etc). Family members are always welcome to stop by (and do - frequently). The house is clean, NO urine smell, and family are even invited to join for dinner or lunch if they happen by at meal time. What is interesting is that the really nice place was only $300/month more, and included things that the "cheap" places charged extra for (Dr. trips, etc. We are in S.Calif - the really nice place is @ $3600/mos, "Bleak house" was $3300. (non-dementia patient, ambulatory but limited mobility, needs to be supervised while walking, assisted dressing & bathing & toileting). I'm not pitching this particular place (they seldom have openings anyhow), but want to encourage you that there ARE really amazing places out there. BTW, this isn't a "memory care" facility, however 3 of the residents do have dementia (moderate to severe). They also won't take residents that cause problems for the other residents (in their opnion it's not fair to the the non-problem-makers).