Ty realized people still thought of the boy he had been just before, and thought it'd be nice if everyone remembered her as a girl. So she decided to make a wish that'd change that. "I wish that everyone thinks of me as a girl, and that any record of my life as a boy is changed to be me as a girl. I also wish I knew everything I'll need to know to live as a girl without incident," she said to herself.
She felt everything around her seem to change to her will. Every photo of him changed to be a photo of her; every reference to her name changed from he to she; the change reverberated back through her life so that instead of a boy being born from his biological mother and adopted by Ty's foster parents, a girl was born from her mother.
In Ty's head, she felt herself become severed from the boy she had been. He still existed in her mind, but felt like something from her imagination rather than anything that had ever existed. She loved how it felt like she had emasculated herself, and removed any idea of her as a boy from reality. Her new gender was affirmed.
She wondered what to do now she'd done that...