Hi, I am sorry to hear about your mother's problem. Since her symptoms have been present for ten years, she might need a combination of medication and psychotherapy support. You should consult a professional for a proper diagnosis. If your mother is unwilling to seek help, you will have to make efforts to convince her to see one. Make a list of things she likes to do ( for e.g. Cooking, walking). Involve her in these activities and try conversing with her about her feelings and thoughts. Spend time with her reminscing about her happy memories. This might motivate her to seek help. Irrespective, try to be as supportive as you can . Good luck!