her hair is brunette
Brunette
Brunette.
Her hair colour is ash blonde.
A hair colour could be brunette , red or even black .blonds are OK but not as good as the hair colour.
lilac
She's a brunette! (Brown haired)
John Cena's hair color is blond with brown hilights
Her hair is naturally Brunette and then she dyed it Blonde and now it has highlights.
Patricia Arquette is a natural brunette, but frequently dies her hair blonde.
Yes, Brunette and brown hair is the same colour. Brunette is just a better word for brown. And maybe some day brown will be removed just like people don't say, "I have yellow hair!" They would say "I have Blonde hair."
Juliet is not a real person. She is a character in a play. Her hair colour is whatever colour hair the actress has. She could be a brunette, blonde, black-haired or redhead. She could be bald for all it matters.