Timmy's mistake

Timmy Turner, being the borderline irresponsible young kid that he is, had failed to properly do away with the Magic Muffin, simply tossing it into storage somewhere. Due to incidents involved with being forced to clean his room, the Magic Muffin ends up getting tossed out the window, and into the lap of his mother.
Mrs. Turner, as with her husband, had always wished that Timmy had been born a girl. Hell, they had initially bought a whole truckload of girl stuff before Timmy was born, thinking that they were having a girl. However, reality was rather harsh.
A bit wistfully, she took a bite of the muffin, offhandedly wishing that Timmy had been born a girl, and not hearing the frantic shout of her son telling her to stop.
The next thing that Timmy knew was that the world- no, universe- had flip-turned upside down with a massive lurch. Changes had occured, and suddenly he was a girl in a world where he had always been one. Not only did 'she' still have her previous memories, but also a sudden onslaught of new ones
Born as 'Tiana Turner', the only child of Mr. and Mrs Turner, she was a studious and hard-working young girl to a pair of proud parents who DIDN'T get crushed into despair by having a son. In this timeline,