AGP (Not AAP) in Cis Women?

How common are autogynephilia-like fantasies in biological women?

Ranma 1/2 is full of AGP fetish fuel and the author is a woman. Sparkling Generation Valkyrie Yuuki is an even more explicit version of this, also authored by a woman. Wren Adams was a woman who would larp as men who had been transformed into women.

The reason I'm researching this is my gf (who is a very good hearted but socially awkward tomboy) has a fixation on this fantasy. She likes to pretend she's a man who has been magically transformed and often the "character" has to be convinced being a woman is a fun / sexy thing. She also gets off on being "forcibly feminized."

She isn't autistic but one of her relatives has a lot of Aspie traits & she has a very high IQ. I've never seen this in any other woman.