Victoria was the main person responsible for starting it, whether it was out of guilt or as a way to cover her tracks is still unknown.
She decided to steal her mother’s car and go on a joy-ride with Declan Porter instead of attending the gala honoring her mother.
Lydia was not happy with recent events and planned to make a speech exposing the truth behind Flight 197. Frank got wind of this and informed his boss. Shortly before Lydia went to the podium, Victoria whispered something into her ear. Whatever Victoria said frightened Lydia enough to change her speech.