Even if your DD stays looking more or less the same as she does now the boys in her age group are going to change considerably in the coming years.
I can clearly remember being taller than all the boys in my year at the end of summer term, when we started back in the September some of them towered above me.
At 14 girls have got a head start on the growth trajectory but by 16 or so the boys start growth spurting and sexual dimorphism really kicks in. By 6th form most boys are considerably bigger/smellier/hairier/deeper voiced than their female classmates.
Of course, this may mean that in a few years time your DD is assumed to be a teenage boy rather than a young adult woman so it’s probably worth getting her one of those proof of age cards as soon as relevant, just so she doesn’t constantly risk mislaying her passport in the uni bar!
I’ve had some pretty masculine phases in my life and I found that while I might be assumed male from a distance/whilst standing still, as soon as I moved/smiled/spoke people immediately realised I was female, so while someone might well shout ‘Hey mate, you can’t go in there, that’s the ladies’ at my back, turning around with a smile and saying ‘Thanks!’ results in an embarrassed apology.
Of course, my experience largely predates all the gender-identity-assumptions/pronoun ritual stuff and now I’m middle aged so while I have had a little boy outright ask me if I was a boy or a girl, his mum tried to shush him rather than interject with a careful ‘or perhaps this is a nonbinary person, little Timmy?’ 😬
A few stock answers might be useful for your DD (eg I told the little boy ‘I’m a girl, but I prefer boy’s clothes’ which he must’ve found to be a satisfactory answer, as his next question was about my bicycle.
’Pronouns? Just the standard girl ones’
’I’m a tomboy, not an actual boy’
if your DD feels like she has to tread carefully with certain people/ use trans-language when pressed she could say something like ‘I’m a GNC cis girl’ but as a cantankerous middle aged terf I’d be more inclined to say ‘I’m female, as in, a girl’ and if anyone asks my pronouns I either say ‘sex based, like my oppression’, and in a group situation I find a simple ‘No, but thank you’ causes just enough confusion to make the group leader move on to the next person.
My blonde son was regularly mistaken for a girl up until he was about 15. He still has long blonde hair in his mid 20s but no one ever mistakes him for a girl anymore, they just assume he’s from California rather than North London!