Zocor and pill pusher

My 81 year old grandmother is taking 20 mg of Zocor per day, AS WELL AS 600mg of Lopid per day. I just read that Zocor and Lopid should NOT be taken together, but the quack of a doctor she's seeing is a real pill pusher, and he hasn't made any attempt and getting her off of this. She began losing muscles last fall after taking the medications for a while, but now she is nearly helpless, and falls and loses her balance a lot. Which medication should be stopped, the Zocor or the Lopid? Both of these medications can cause muscle deterioration. Since she will not be going back to the quack, I was just wondering which one we should take her off of, or possibly both. Thanks for any information.