R&E will close on the 28th December - see this thread. https://www.religionethics.co.uk/index.php?topic=22932.0#new
And nor should he be ashamed but given that he's a man then he should compete in male competition. https://www.bbc.co.uk/sport/athletics/67336536
I think this is one case where you should definitely be using her preferred pronouns. She thought she was a woman right up until her condition was discovered. No, she shouldn't be allowed to compete in female athletics, but you don't have to humiliate her too.
I would prefer not to muddy the waters with the incorrect term.