Make sure your DS can see her baby being lifter out. Insist they put the screen down for that (nicely of course!) make sure the pull the baby out straight, and if they have to rotate baby's head to pull him out, then book a cranial osteopath for him ASAP. Watch carefully how they pull the baby out.
Get them to put the butterfly cannula in the side of her wrist, not the back of her hand, as it's frigging hell, and so very very sore to keep bumping it off the side of the cot.
Make sure they give her a small incision - this can vary quite a lot, a bikini line one is better than a up down one. Make sure they stitch her uterus in two layers, not a quick one layer stitch - important if you ever have sex again! And have another baby. Discuss all this BEFORE you are in theatre with the doc who will be cutting and stitching.
After the section, she will find it hard to lift - it's major abdominal surgery after all, so lift and carry for her, for weeks until shes able to get the severed nerves in her abdomen working again for her core strength.
Bring her back to the docs immediately if there is any fever, swelling, or nastiness on the wound.
She should have an appointment with a physiotherapist as well, which you can book for her, and an appointment with a lactation consultant as well, if she's keen to breastfed, as she'll need to learn different techniques for holding the baby as her wound will be very sore. Bring the baby out for a specified number of hours when she wants some sleep. Don't pop back in if you've forgotten something, as you'll disturb her. Don't go for longer, as she will need to feed the baby. Be predictable and reliable.
You may find it a very emotional experience, so be there for yourself as well, and be there for her too.