Hello kumbhat prakash
Welcome to health care magic forum
It is a case of anorexia
( loss of appetite ) that do occur in certain people at this age .Taste bud help in recognizing taste of eaten substance & Any thing abnormal.She might be having problem with her teeth ,so she cannot chew the food properly.Give her good appetizer along with multivitamins.Condition may improve to some extent.
Wish you good health