When she began talking and expressing herself, I realised there was more to it. She would talk about wanting hair as long as mine and wanting to wear the same clothes as me
This is about as believable as a two year old Jazz Jennings supposedly saying "I want a vagina." These are not things that toddlers come out with.
I don’t know about how normal it is for toddlers to say things like that, but when one of my DS’s was a similar age and I was pregnant with his younger sibling, he said that he was a girl and that when he grew up he wanted to have a baby in his tummy like I did and be a mummy.
He went off the idea of being a girl after I told him that, while he could be a daddy, someone born a boy can never grow a baby in their tummy. I just took it all as him wanting to copy me rather than a declaration of trans-ness.
I also had a little train instead of a little boy for a while.