What can I do if my parent refuses to receive medical treatment?

My Mother is 72 and refusing medical treatment. Six weeks ago she was admitted to the hospital for tests.She is has COPD (Chronic Obstructive Pulmonary Disease) and refused every test they tried to give her. The doctor put her on Lasix and potassium. Her stomach had gotten very big and the doctor said it was water. While she was in the hospital her stomach went down a lot. After two days she refused any more treatment and left the hospital. She had these really big sores before she went in the hospital and they got worse after she left. I have spent over $200 dollars in the past month for bandages and supplies for her. The doctor sent her to the wound care clinic and after the first treatment ask her to be admitted to the wound care hospital. She went in on Friday and was supposed to stay three weeks. After one day she signed herself out. Now she doesn't have an inch on her body that doesn't have a sore. She refuses to go back to the doctor now. They did find out that she has congestive heart failure. I am begging her to go to the ER and she won't. Is there any thing I can do to make her go? I'm at my wits' end. Thank you very much.