Tight, spiral curls from root to tip or loose beach waves that stay all day with your straightener and some foil. Couldn't you just use her trick of coiling hair sections then pressing with the straightener without the foil? I'll have to try this.
I love the idea of what she did here, for a looser and greater looking bun - take already curled / waved hair, do a low messy bun, and then take pieces of the sides and pin them up leaving little pieces of curls or waves out. This looks so pretty, and you don't have to worry about having to do your hair again later if it gets messy, because it already is! (Don't you love that?)