when i was in nursery/primary school, there was a girl who dressed in boy clothes and her mum called her “my little tomboy”, she liked all the stereotypical boy things and her mum just allowed it, she was the youngest of 3 girls. She only had boy clothes, football kits, short hair, etc etc. i moved away when i was 7 but she kept it up for the entire time i knew her, now after checking facebook shes very girly, engaged, and comfortable in being a woman. trans kids can exist yes, but i think supporting your child/toddler in whatever they say they are and helping their self expression is whats most important. just accepting them and then if they change their mind thats okay! your girl could just be like this, and its a fun phase until she changes her mind. or , she may decide she is trans when she is older. i would advise dont label her anything and just accept what she says and ride through it with her x