I can understand the agony you are going through, but, now I can offer you a few suggestions that might help her.
1. She would benefit from pool therapy by weight relief by increasing the muscle strength of Quadriceps with progressive exercises.
2. Daily program of part hydrotherapy and part dry land rehabilitation would be the ideal thing. Pool therapy when given first, help to relieve the pain, thus helping to improve the performance and function in dry land rehabilitation.
3. She can try TENS at the physiotherapy clinic along with exercises.
4. Repeated isometric and resisted exercises are a must.
5. Yes, you can get an MRI done to know the condition of the muscle.