I have now read multiple articles and have not seen that she started taking hormone blockers at puberty...
This is the main article that I read, of which the premise is regarding how to corporate trans people and retain gender fairness in sport
https://interactives.stuff.co.nz/2018/03/a-level-playing-field/
“…But when she won an event in Rotorua by more than 30 seconds, it set off a firestorm of online discussion and calls for her to be excluded…”
“No-one knew that she wasn't just competing against other riders, but her own body - the hormone blockers she'd been taking since 17 had reduced her testosterone levels to below those of most women.
"I was losing strength and losing speed on tracks even though I was training and riding really hard," she says. "It was demoralising - you're trying to push yourself as far as you can but you're going slower and slower."
But she didn't want to come out as transgender, fearing hateful comments in a male-dominated sport.
"So I thought, 'I'll just keep racing in the men's field at a disadvantage'.”
Her times began improving again - although she had to train harder than ever. She figured she'd look into switching to the women's category for the 2018/19 season, but her plans were up-ended at the very first race of this season, in Rotorua last September.
…Like many sporting federations around the world, Cycling NZ has adopted guidelines issued by the International Olympic Committee in 2015 , requiring transgender female athletes to prove their testosterone level in serum has been below 10 nmol/L (nanomoles per litre) for at least 12 months prior to first competition.
The average testosterone level for young men is 24.2 nmol/L and for women around 0.6 nmol/L.
Weatherly was able to provide blood tests showing her levels were in the 0.1-0.9 range, a result of having had injections of the drug Lucrin - used as a treatment for prostate cancer and essentially a form of chemical castration - when she started transitioning at 17.”
“Because of her ill health she didn't start puberty until about 16 or 17, she says. She'd always felt something wasn't right with her body and puberty was particularly stressful.
She saw psychologists, was diagnosed with gender dysphoria and began taking the hormone blockers - Anton became Kate.”
"…Sorry Kate, I feel for you in this situation, but I don't think it's fair on the biological girls," someone posted. "Maybe a new gender neutral class should be created?"
That's a common suggestion, but doesn't appeal to Weatherly.
"My thing is, I'm not gender neutral, I'm a girl. The whole idea of a third category invalidates my sense of identity."
When Weatherly won the national champs, beating Rawson by 13 seconds and the third placegetter by 47 seconds, it threw gasoline on the fire…”