Description: screenshot of Tumblr with two posts. One describes how Sherlock Holmes would figure out you're trans before you even do. The second describes how Hercule Poirot would figure out you're trans after initially suspecting you of murder and then clearing you're name. Then he gives you a kissy kiss.
Yes, that did happen. She was supposedly a teen supermodel who happened to have androgen insensitivity and XY chromosomes.
She wasn't really trans, though. She was assigned female at birth, lived as a woman, and as far as we know from the episode's story, she kept living as a woman. Trans-adjacent, but not exactly the same thing.