Can My Grandmother With An Abdominal Hernia Safely Do Exercises To Strengthen Her Core Without Surgery?

Hi there! I am seeking medical advice for my grandmother. She had hernia surgery about 3 years ago, and now has another hernia, in the abdomen region. However, she does not want to meet with her doctor because she s afraid of undergoing another surgery. She says the hernia does not currently have any symptoms accompanying it. However, she has asked me to help her establish a routine for exercise. Particularly to strengthen her abdominal muscles.. Do you have any advice?