Mom could always go back to the doctor's office, just to weigh herself, at least once. The other thing I would strongly advise is for her to exercise---now that can mean parking your car further from work, walking on lunch break, etc--anything to get her body moving on a regular basis. Then she can progress to whatever type of exercise appeals to her: walking, jogging, working out at a gym, exercise tapes (take your pick), Pilates, lifting weights (really easy to do at home), etc.