Worried about my Mothers health/life?

You can try seeking professional help. If that is out of the question then you can try motivating her yourself. Try taking incentive and help her with the grocery shopping. Go with her and try and make more healthy choices. Also, motivate her to exercise by exercising with her. Take it slow by going for a walk in the park or in the street. Purchase the small dumbbells and during low exercise times, such as watching tv, use them. Small steps are always good.