Before advising you on the surgical aspect. it is Better To know What exactly is causing the exaggeration of symptoms of tennis elbow. That depends on what does your wife does for living. please consider visiting an Occupational Therapist to help your wife treat and deal with the problem. Also Surgery in tennis ELBOW is rarely needed . and done usually in emergency cases.
Next Steps
Consider consulting an Occupational Therapist and avoid Surgery if possible (if your wife is a sportsperson ONLY THEN you should OPT for surgery as the game would be closer,
Health Tips
Take a second Opinion. STAY HEALTHY