Another thing to drink instead of the gatorade/powerade is coconut water. It's the best source of natural electrolytes. It comes in containers like juice boxes and you can get it at health food stores or Wegman's in the health food section. My nutritionist had me drinking one container a day when I first had my surgery and that's when I was having 20+ bms (had a subtotal) I never had any problems with dehydration.
Just a suggestion, as I couldn't handle any sweets. Hope this helps and prayers are with your Mom and you.