Well no. Although in USA I believe 14 year olds have had double mastectomy.
If the child has sex dysphoria then they need serious help psychologically asap as it's a huge deal.
However.
Small children see things in (naturally) a pretty absolute way. They in general are VERY wed to gender stereotypes. As they try to understand the world.
At that age most kids are
Boys have willies. Boys like football and cars and blue and dinosaurs.
Girls don't have willies. (Male as default naturally). Girls like princesses and pink and have long hair.
And I mean more or less that's that.
If a child that age prefers stereotypical girls things. And doesn't like being with the boys. Then what does that mean? No willy, wear pink etc.
I don't know this child this is in general.
I have known boys who refused to eat off 'girls' plates. IME as well it's much stricter for boys, all this stuff.
Also IME many girls go through a phase of massively rejecting 'girls stuff' at some point from about 7 upwards.
Then they settle down and just do their thing around puberty.
For boys society does not tolerate this option in the same way.
What needs to happen is break the gender ideas/ enforcement, freeing everyone up. And take it from there.