Know that you had a stress relief the other day when the surgery went well, but your Mom coming home is great! Check in on her each day if you can.
People get stubborn sometimes and will say lift something they shouldn't. If your Mom knows you will be there at a set time to take care of a few things she will be more likely to leave them.
I help out with my grandparents a lot. If they know someone is coming they will leave little projects, but if I just stop by they tend to have done them on their own. Maybe it's just their stubborn German nature, but guessing it's just more of an independence thing.
Hope recovery goes smooth for your Mom!