Hi, Anna Marie. Well, I started training as soon after my abdominal hysterectomy as I was cleared to do so, but since I took me a couple of yrs to breakfall, that in and of itself won't help her...
It was during my recovery that I started looking for a m.a. to start. So...let's see...I had surgery Oct 31 1995 and I started training mid January 1996 (for comparison sake, IIRC I was cleared to drive a car mid December). When I started training, again, I was a newbie, but what I recall specific to the postop stuff was, anything bending back was done very slowly and gingerly because of how it stretched the abd wall and fascia. In retrospect, were I doing forward rolls I'd have only done low and small ones for probably the first couple of weeks and not progressed to a breakfall until I was comfortable with full big rolls. Again, though, this is not direct experience.
If your friend would like to contact me directly please give her
sfcolor@yahoo.com for ANY questions aikido-related or not.