I had 1 scheduled c/s ( breech) that was greatly disappointing to me. I was able to come up with a c/s birth plan, which helped. It's posted in some other threads maybe on the VBAC board. Also, definitely have someone bring a camera - one of my fave pics is the first one we had as a family - my anaesthesiologist took it for us and despite the fact that I disliked the surgery, I love seeing my son for the first time.
Agreed - the mom can ask for several things - you may or may not get them all.
1 or more hands free (maybe can get)
mirror to watch surgery (maybe can get, maybe don't want)
if she doesn't know the sex, have the doc hold up the baby to show her husband instead of announcing "it's a boy!" - this was a nice touch
husband can hold the baby after surgery and for remaining time
I got to take my son as soon as they were done with me - had him in recovery and was able to breastfeed
my midwife was in surgery with me for support - she let me know what they were doing since I couldn't see
Mostly, I would help her mentally prepare for the birth. have her talk to her baby and make sure he's ready to come out. Also (this is key) tell her to shave the top 2" of pubic hair off BEFORE she gets to the hospital. I promise her husband/partner will do a much nicer job of it than the nurses will
