If she's going 'natural' (which I HIGHLY recommend !), tell her to start doing cross-ab manuevers A.S.A.P. after delivery.
Don't be brutal >>> get 6-8 hours of sleep after a delivery.
After that, start.
START.
Even lying flat in bed, start... leg lifts (gently), focus on the abdominal area... meaning think about those softened muscle areas and cross train them. It's NOT extreme, and not excessive. Do what you can, then stop. Why would this be considered selfish or extreme ? I WANT my body to recover, I EXPECT my body to recover... & so doing some simple exercises shouldn't freak anybody out, ey ?!? LOL