Welcome to healthcare magic forum
it is necessary to check her endocrinal /hormonal
so that if hormonal imbalance is the cause for the increased growth of hair it can be corrected with the help of medications to avoid further growth of hair on other parts of the body too..
you can use herbal hair removing creams to remove hair .. its safe to use in childrens with no side effects..
and once appled is effect will last upto 2/3 months.. and your kid will not be embarassed any more..
wishing her good health