My mother has Multiple Sclerosis and requires a care facility with 24 hour care. Not necessarily a nursing home but she needs help with dressing, transferring to electric chair, etc.
Does your mother speak Spanish? If not you're going to make her unhappy.
Also, even if you'd find a home that suits your mother's needs don't expect the quality of the care to be as good as you're used to over there.
Most families take care of their own here on the island, that's the standard. Even if you have to go to a hospital it's expected that a family member is with the patient 24/7 to take care of her/him. The same goes for elderly who need assistance. They move in with a daughter, son, niece or one of them moves in with them and they may or may not get some professional help a couple of hours per week.