Hi I am sorry for your situation and for your mother. I understand this is one of the difficult part to accept, at the earliest take her to the psychiatrist for medication and guidance, further she can approach psychologist for coping with the situation and guidance to handle herself in a better manner(therapy). Change of place and lifestyle will help her to put for the best. Take care. Stay positive.
Health Tips
Chanting Omkara and focusing on the things that she likes might help her to accept the situation.