Question

Hello and blessings to the Rabbi! 
I’ll start with the question: 
My oldest daughter, almost 11 years old, yesterday took 200 shekels from the bag of the non-Jewish cleaning woman who works in our home.
This morning the cleaning woman called, and we found the money in the girl’s bag.
My question is: how do you deal with something like this??
It should be noted that the girl is smart, talented, happy, and positive; she has neither social difficulties nor any visible distress.
Financially, I believe in independence, and she always has her own money in her wallet. 
I give her almost everything she wants, of course within normal limits. 
So this is not coming from lack of money or any kind of distress. 
So why? 
Where does this come from? 
And again, thank you, Rabbi Michi. 
And sorry if I’m going beyond the kinds of topics usually asked about here.