There never was any higher bidder on Tiana's building.
The realtors just refused to sell it to her because of her... "background."
•That was what I assumed from the beginning. This being a family movie, they probably couldn't come right out and say it (Politically Correct History and all), but the implication felt pretty obvious to me.
•It certainly seems this way according to the time line. They said she needed the money by Wednesday, right? They were changed back on Wednesday morning, the day after Mardi Gras. During the timeskip to their human wedding Eudora had time to make Tiana's dress and Naveen's family traveled to New Orleans. It would have to be past the deadline by the time they finally went to buy and yet the Fenners were still in possession of the building.
◦Plus, it never indicates that they acquired any more money to pay the extra fees that were imposed — Louis just glared at the realtors really hard! On the other hand, one wonders why the realtors didn't just refuse in the first place, rather than waiting for the party to tell her.
■Because they're ********* who enjoyed giving her false hope.
■According to the novelization, the Fenner's accepted the original price, thanks to Louis.
•This hardworking female Aspie troper feels silly to have not realized this in the first place. People have been pulling stunts like that over me for as long as I can remember, and there's no way around it.