Home Alone 3
When Agent Stuckey told Stan that he wasn't at liberty to discuss "it" (meaning the reason why Alex was in danger) with Stan, Karen and Molly, Molly stopped him from leaving (by forcibly closing the door) and told him, "The 'it' you're referring to is my little brother", thus showing that although she showed disrespect to Alex at first, she still loved him very much, as he was family. After hearing that her younger brother fought off the criminals and survived, she was impressed and told Alex "Bud, you're a hero!".
She is last seen with her family, the police, and the FBI, celebrating at her home.