1. She regrets being so vocal about wanting Vanessa out.
When Becky won HoH and went gunning for Vanessa, she made it very clear to everyone—even Vanessa!—that she wanted the card shark gone!
Unfortunately, Becky's allies switched lanes and sent Shelli packing instead, and that's when she knew she was in trouble and Vanessa would probably try to seek revenge. She regrets having approached the situation so boldly and believes that's what ultimately sent her out the BB door.