I agree Cabro. Fracci was brilliant. There's one ballerina (that I know of), who has (had?) the affectation of wearing her hair down throughout Act 1: D. Vishneva.
Disorder in and around Giselle's head?
I much prefer the Fracci method. I hate it when the hair becomes the star of the last third of Act I. We first see Giselle in a tight, neat, little bun. But at her last entrance, the bun is a little looser. Then there's the whole production of undoing it so that the hair falls. Too much unnecessary stage fuss distracting from the action, to my mind.
I think that makes her look about as innocent as Jennifer Lopez. Maybe she's
stopped doing this.
Re: your first point, I've always wondered what 'flavor' is Giselle's psychosis? Is she paranoid schizophrenic, delusional, or just a 'buffet' of insanity? I also agree with Mohnurka's conclusion that truly great dance actresses can illustrate those nuances and successfully get the point over whether the 'do' is up or down. What works for one doesn't necessarily work for another.