this surgery is very invasive and it is true that some procedures cut the abdominal muscle others don’t. Here is a link for you:
As I am not sure what happened to your client but have worked with women that had the surgery with attached abdominal muscle. Here is another helpful link: http://www.pinkribbonprogram.com/
There is a lot of pain and lack of mobility. I can not make a clear recommendation based on your statement but those 2 links maybe helpful. If you like reach out to me and clarify.