Choose the foods as per her choices
A rational combination of balanced diet with moderate calories and good amount of protein and walking 30 minutes daily are enough to keep her healthy and fit.
Some suggestions can be considered as per her liking.
•Dried fruit and nuts
•Fruit OR Vegetable juice along with Chicken or Paneer or Vegetable sandwiches (preferably brown bread)
•Omelette with toast or roll
•Cereal with milk
•A protein or energy bar
•A protein or energy shake.
She should be eating low fat meals. Fat slows down digestion. It would increase the nausea
Include more of whole pulses, legumes, milk products, soya products, peanut butter, nuts and dry fruits, chicken in her diet. Avoid junk foods, oily foods, carbonated beverages, alcohol, substitute with fruit milkshakes, chicken / tuna sandwich, boiled pulses like rajma, chole, paneer tikka, tofu sandwiches, dry fruit milkshakes, lassi, buttermilk, whole milk, groundnut chikki/ burfi, green banana which are high in protein and low in fat.
I hope this answers your query.
In case you have any follow up queries or doubts, you can forward them for me, and I shall be glad to help you.
Please accept my answer in case you do not have further queries.
Wishing you good health.