Maybe it's because she's a bit tired of her fuddy-duddy parents. All day long, poor Ellie hears, No, you can't chew that! and, Let go of that! and, No chasing cats! and, Come on, Ellie. Time to go outside and go to the potty.
But kids, like puppies, are all about the fun.
"Evermore joy ye." ~1 Thessalonians 5:16 (Wycliffe Translation)