She's a tomboy.
Tomboy:
Basically unisex clothing but still feminine, think of Aaliyah when she first came out:
That's a outfit a man or woman could wear and she is still wearing feminine accessories and has her hair and nails done.
A stud usually looks like a hood nikka is the bluntest way to put it

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Also just having long hair doesn't make a stud not a tomboy and vice-versa, this is s stud she just has long hair: