Usage of the word hair

[Navi]

If a woman's hair is not tied, in a chignon or in plaits, whether it be long or short, would you say:

a-Her hair is free.
b-Her hair is untied.
c-Her hair is loose.
d-Her hair is hanging free.
e-Her hair is hanging loose.

I suppose d and e could be used if the hair is long, but if the hair is short, I don't think 'hanging' would be appropriate.

[Jamie (K)]

If her hair is long enough to braid, we'd say she's wearing her hair down.

If we can't say she's wearing her hair down, then her hair is too short to braid anyway.

We don't call it a chignon; we call it a bun. I had to search more than one large dictionary before I found that word.