Say Cookie, No Quacker

Loren use to say "cookie" so clear and than all of a sudden she started saying "quacker"! I have worked and worked with her on saying "cookie" but she just is being a little stink. I think she is just funny now cause she will yell "quacker" back in my face and everytime she says it I laugh or anybody around laughs! She talks pretty good and catches alot of things said but this word we are having a struggle with. Make sure your volume is turned up so you can hear the little stink!