I know that in season 4 some of the cheftestants said that wth the Wedding Wars challenge that they stayed up all night to complete it, but that they had about 6-8 hours between the end of that challenge and the judge's table. They were asked tp put on the same clothes and do their hair the same make it look like it happened at the same time.
I'm all for a chef defending a dish. That is what they should be doing and how they should feel about what they do. However, Jen's behavior was more defiant than anything. She was rolling her eyes, crossing her arms and tossing her head as soon as she realized they had lost. Did she realize that she had a good chance of going home? I wonder what was left on the cutting room floor that would explain her behavior.