She's not a monster but she is jealous!!
Overheard- "I am going to take that baby away!" So I asked, "Where are you taking the baby?" She realizes she's busted at this point and says "To ice cream!" Yeah, nice save, but babies don't eat ice cream!
She points to her chubby cheeks.....and says "I want to put this face on the baby!" Meaning she wants to be the baby!