Machiavellianism??

According to Oxford English Dictionary, Machiavellianism means "the employment of cunning and duplicity in statecraft or in general conduct".  Too strong a word for a less than two years old toddler?  But I don't know what else to call it.

The victim here is my mom and this is her account of the incident.

Its time for her haircut again, but it has to wait till the weekend. So my mom had put on a  tiny pony to keep her hair from falling into her eyes. Immediately, Jillu, as usual, put her hand to the hair band to remove the pony. As my mom was feeding her mosambi, she said "No mosambi if you take away your pony". So what does Jillu do? Behave like a very good girl with no signs of mischief as though she is even unaware of its existence. 

And then, the moment she completes eating the fruit, before the blink of an eye, in a flash, the pony is undone.