I understand your concern for your mother. For losing weight, she first needs to set her metabolism levels and body clock right. She must:-
a) Follow a strict dietary regime and set her body clock right
b) Have 6-8 small but frequent meals and not skip meals
c) Not compromise on nutrition while trying to lose weight
Next Steps
Have small frequent meals and finish dinner by no later that 7:30 pm. Avoid foods that are high in fat and
sugar. Have foods that are nutrient dense and not calorie dense. Include things like almonds, roasted sesame seeds, salads with a lemon dressing. You can contact me on direct consult for more actions points on how to reduce weight and have the correct combination of foods that are nutritionally adequate. Alternatively, you can also visit me to get a customised diet plan.