A cunning person will never show his expressions.
Gulabo can't hide her expressions. That shows that how innocent she is.
Expressions are closely tied to emotion, they are more often involuntary. It can be nearly impossible to avoid expressions for certain emotions, even when it would be strongly desirable to do so; a person who is trying to avoid insult tries to give unnatural expressions, and thats where he is caught
I think gulabo's face is 16 kala sampuran and carries expressions of all Raas.
In the promos she is making faces of Pri and she will get more brickbats now.
This bua can make "gadhe ko bhi baap"