Children generally eat a little at a time. So you can make meals calorie dense by adding ghee/ oil and
sugar of she likes sweet taste. You. An also use sattu with water ghee and sugar . It's okay for a child to have a few spoons at a time. Do not force feed. Try reducing milk gradually , this will increase her appetite for other foods. Also offer fresh fruits as puree or thick juice.
Next Steps
if child is active then no need to worry. Just make meals more calorie dense.