Hello dear! i can understand your concern. You can make a diet chart of the required calories at this age for your child.That should contain a balanced diet with frequent intervals like at 8 am in the morning give her egg,sandwich or bread with tea/orange juice whatever she likes. at 10 you can give her fruits rich in water like watermelon or melon/orange can also give cucumber etc and likewise can add different items after intervals containing foods which are rich in calories combined with fruits/vegetables having more water. Similarly you can give her different flavoured milks,you can add different flavors yourself like horrlicks,chocolate,cardamom etc. you can give her plain water too when she is playing around in attractive water bottles or you can make simple plain water attractive by making fruits like strawberry,kiwi,apple slices in water,in a clear bottles. These things attract the child,they drink this super amazing water and also healthy as it has antioxidants. Make one bottle of one litre water with half apple cut in slices,one strawberry and one kiwi in clear bottle.Make her drink this whole day in intervals. you have to keep this water a little cool (not ice cold but you cant make it warm as it will change the taste). Hope it will help. Wishing your child good health :-)