I'm thinking that she has had some problems when she was a child and I can see the scenario now.
She would be watching sesame street when on would pop the cookie monster. Making her hungry she would go to the kitchen and ask her mother for a cookie. But what's this they're all gone...Who's to blame, only one could have done such a thing. The cookie monster. And so when she grew up she got her revenge, ha now who has all the cookies.