lol....
what happend ov this post?? m amazed...
well simple advice u talk her directly...
if u think that she had contact with others. then surly she knows the language... and just pretending that she dont know the language.. and dont fire her.. a family is living on your money.. so dont ruin that family.. simply talk her.. and tell not to do this in ur home.. thats all... coz u dont like such acts in your house, nor to invite her friends in duty timings.

..there is no rule in the game of life and death..