Hi OP - my family went through similar when my ASD child was 11 and nearing secondary school. Girl in this instance and needing to explore their identity. My child was undiagnosed ASD at the time and do think relevant.
I think these children can feel like imposters sometimes in the world they are growing up in, feel like they don’t quite fit and a logical way of exploring why and trying to find an explanation is by thinking they are wrong, so their gender could be wrong.
Any way we didn’t encourage but didn’t didn’t discourage, we listened we supported we followed their lead. We navigated this period by not dismissing but by accepting. I made it clear that all I wanted for them was to be happy, I was clear from the start that they could dress and express them self how they wanted but there would be no hormones medical intervention until they are adult, should that be what they chose. I said this from the get go - the first time they told me they wanted to be a boy. It wasn’t because i didn’t love or support them, but because I said they needed time to understand them self properly. That topic never came up again. I think you need to be very direct with this expectation don’t blur the lines and separate it completely. I also limited social media use, they weren’t allowed TikTok or insta until they were 14/15. They had snap chat at 13 (monitored) - so they could talk to their friends and not feel completely out the loop. But I just felt like the former would have fixated them more and skewed their thinking on their gender, they needed to work it out either way without too much outside influence.
I dealt with it by neutralising their gender, removing she and he and just letting them be. Some would say that ‘s a label in itself but it was very useful and very freeing for my child. They were then free to explore without social restrictions and expectations. They could just be. - they flirted between being really boyish, to then being gender neutral, back to more masculine and then now experimenting with girls clothes and make up again this year. They are have more of an alternative style emo but not full on so it’s been easier in that respect for them to go between. I also noticed if their mental health was poor they would revert more so into the boys clothing think it felt safer for them.
my child is nearing 16 now, I still say they as my brain is programmed now, but they are more of a she. It wasn’t forced by me it happened organically, we never made how they expressed them self a big deal outwardly it was a non issue. Don’t get me wrong I agonised over if I was doing right by my child and had many sleepless night’s. I was scared for their future. However, I would have supported whatever path they choose but it would have been hard for so many reasons.
My advice is go with the flow, remove expectations, reframe your way
of thinking. The best thing I did for us all was when I said to my self “this isn’t about me this is about them” - that removed my hurt. Don’t get me wrong there were times it was hard, but it doesn’t have to be. Just be the amazing mother you are love them unconditionally and you won’t go wrong whatever path they choose. Be their one champion be the person they talk to and open up to and just hold their hand.
I don’t regret for a second how we navigated this period, my husband struggled more and questioned me a lot and was a lot more cautious. When the long hair was cut he tried to stopped it I put my foot down. He tells me now I made the right choices and he thanks me for how I handled it all. Our child is amazing happy and know’s they are loved no matter what. You’ve got this op..