Sorry to hear your mom is having gall bladder problems. They hit the older and younger folks alike. I will certainly keep her in my prayers for successful and uncomplicated surgery, and that she will soon be home and feeling much better.
Amy had her gall bladder removed last year because it was non-functioning. They sent her home in about 2 days. She did fine. The surgery was laparoscopic, so not much in the way of places to heal. My sister also had laparoscopic surgery and healed quickly! :)
Prayers for peace of mind for you both. May the angels keep guard over your hearts and minds, and physical bodies, too.