Growing old and infirm alone in the DR is a tough situation to be in, especially as a foreigner.
Because of the family connections and cost, families take care of their elders. So, unlike the states (or Europe) there are very few group homes, ACLF's or nursing homes here.
I do know of one in Jarabacoa that was founded by the former owner of Cemento Cibao and run by nuns. It's a nice facility by Dominican standards, but always has a waiting list. That's not to say the management wouldn't show some compassion for special situations. It's called Centro Geriatrico Margarita Herrera, and their listed phone number is 809-574-7220. It is just outside Jarabacoa on the road to Manabao.
If necessary, I would not hesitate to put Mom CB in the facility. The staff is exceptionally nice. In fact, she toured it and said she'd be most happy there. Most rooms are shared and are spacious. Many have a porch or balcony.
The cost is variable, depending on ability to pay. Just be aware there is always a waiting list.
Good luck!