Jessie was learning from Andra's aggressive behavior and copied it. She basically was just as disrespectful as Andra. She frequently hurt Leah. For example, she deliberately pushed Leah off a tricycle, got on the tricycle, then circled back on the tricycle in order to run it into Leah. In the grocery store, she also had Leah in a headlock, apparently to try and prevent Leah from touching her steering wheel.
She also yelled at her parents and threw temper tantrums, and was seen slapping Barbara across the face during the Family Test Run.
She was 3 when she appeared on Supernanny and she will be 17 in 2018.