Some people experience little or no pain after surgery and then there is me. I was miserable for about 5 days, could barely walk. So, be prepared. A recliner, lots of pillows, some gas-x, clear liquids, broths, ice pops with no chunks of fruit in it, etc.
Like Jiffy said, remind her to sip sip sip, make sure she gets plenty of fluids so she doesn't dehydrate and when she is ready to eat, even mushy food, she must go slow.
When you leave the hospital, make sure the doctor gives you a prescription for pain meds because you never know if you are going to need them. I certainly used mine... I was in tears on the way home.
I had plenty restriction right after surgery and I think most people do, its the 6-8 weeks post op when the swelling goes down and there isn't much restriction there. But that is when the fills should start to happen. SLOW IS GOOD !!!
Mostly !!! follow her doctors orders.. there is nothing more important than that. The first few weeks post op is not about weight loss, its about healing inside.
Good luck to your Mom and you sweetie.. you are a good daughter for taking care of her.