I don't think her hair holds a style well at all. Some hair textures just don't, no matter how much product you put in them. Those photos of the floral dress seem to show a nice, "done" style (see the first, full-length shot posted here) quickly deflating into flyaway tangles as the event went on. If I were her I'd probably wear it up all the time to keep it under control, since that seems to work for her, but then you see it looking its best while down in a situation like that family photo (where she likely had someone touching it up every few minutes) and I guess I can see why she doesn't give up the dream that one day she'll manage to actually wear it down and keep it looking nice all the way through an engagement.