As much as I don't like Abi, she played really smart last night. She didn't bid at the auction, and when Jeff asked her about it, she said that she knew she was leaving and would be able to eat then. I believe that this put everyone else at ease...and it never occurred to them that if the advantage showed up, she would be ready for it.
And Jeff hadn't even finished his spiel when she bid her $500. It wouldn't have mattered if anyone else had enough money at that point...she was so fast that she got it before anyone knew what happened.
The advantages have always been advantages.
(I also think that last week's tears were an act on her part. I don't think she's as upset as she lets on. But that's just my opinion.)