How do I deal with depression in my mother?

My mother is 94 y.o., mobility problems, living in Assisted Living facility. She has never been sociable and isolates more than ever since she cannot walk. She sees few people other than the caregivers and dumps all of her emotions on me when I visit, almost daily. I do her chores and she emotes. I feel like I'm losing my life in her problems and it is affecting my own mental health.