I don't know exactly if the anatomy of trans women is similar to that of non-trans women. I'm ignorant about this. However, if there are equal conditions, it can happen in trances. If there are no equal conditions, I think it can be opened to a separate category. Why shouldn't there be an extra category of trans women or trans men next to men and women?
Current science actually shows that trans women perform worse than cis women in several categories and identical in others. Which correlates with the fact that in the 20 years that trans women have been allowed to compete in the olympics, not a single one has made it there. It was a small study and needs to be expanded upon, but is still better evidence than what any of the reactionary bans have.
I believe the claim is not that she is trans, but that she is a chimera: her mom got pregnant with boy/girl fraternal twins, and instead of developing separately, they merged into one embryo. The other boxing organization that disqualified her claimed that some of her cells have a Y chromosome.
Her anatomy is all woman, and has been her whole life. Whether the test that showed she is a chimera/mosaic embryo was accurate, and if so whether those few cells with a Y chromosome have any effect on her athleticism, is unknown.