Often when a dog decides to stop eating it means that they are going to die. Eleven is an old dog when it is mixed with wolf. Since the dog has been seen by a doctor I would suspect there is not much to be done for this dog save to make him comfortable (manage his pain).
So sorry to hear of his troubles.
Probably the best thing right now is to make her comfortable until tomorrow. Try to keep her from moving around too much. A crate or dog travel pen is commonly used to avoid moving around. I would place her inside.. right after she uses the bathroom one last time and given some food or water. Don’t keep touching her where it hurts and don’t fuss over her just keep calm and relaxed. Good luck.
Unfortunately there is no pain medication you can give her. Keep her calm and laying down. You can also try ice or heat to her painful area.