Daisy is Fawful

It's a Conspiracy!!!
Daisy's secret alter ego is none other than Fawful himself! (Or maybe, er, herself?) The more you think about it, the more it seems true!

Evidence
The first recorded evidence that Daisy might be Fawful was in Toad Town in 1975, during the Yoshi's Island Scandal. She assumed most Toads would be gone, and changed into Fawful in front of a shocked Toad who was still around. All other recorded evidence was either lost or burned by Daisy. Or maybe they were used for Cheeseburger meat.