In "Who's in Charge" Stella gets a lesson in responsibility when she volunteers to watch her best friend's dog, Bella, for a few days. The only problem with this plan is that Stella didn't ask her mother for permission. With new baby Marco at home, Stella's mom already has her hands full. But Grandma agrees it's good for Stella to have some responsibility as she's getting older. It looks as though Stella has things under control. It's only for a few...