Anne, I've never heard of "moh's surgery", but what you describe sounds very similar to when the Doc took my Dad's cancer off his cheek. They'd do a little cutting, send it to the lab, then excise a little more, until the lab results were clear. When they were finished, it looked like someone had taken a small melon scooper to Dad's cheek. It healed very nicely, with only a small, virtually unnoticeable scar.
Sadly, that skin doc, his son, his assistant and asst's dtr, and others from his traveling crew -- 10 in all -- died in a plane crash just a month ago. They routinely flew throughout central Utah to share their skills with folks from rural towns. Such a loss.
(Sorry, but this weighs on my mind and I just haven't had anywhere to express it.)
Best wishes to your dear friend for her surgery.
And extra hugs for my furry Ozzie friend: