Hi, sorry to hear about your mother that she is facing difficulties to walk. Answer to your queries are natural food that eases muscles n joint pain is ginger, give her 1/4 tsp of ginger daily mixing with tea or making juice out of it. Whichever preferred. It will help her.
For salads any veggies can be added , sprouts, Chana, can be added, and just to enhance her
calcium intake you can add grated paneer or hung curd as salad dressing . for weight loss her intake of carbs, sweets n deep fried foods should be avoided.
Little bit of walking according to her comfort is required, at least 4days a week.
She needs detailed customized diet plan for her well being. You can connect to me for personalized consultation.