Yeah she stopped the woman from curtseying. They obviously know each other well so M had a bit of a "Nooo!" reaction. That said, it's always been said it's optional so who cares?
I did notice that the hair-curtain was really obscuring her vision as she was walking up to the stage. Made me quite nervous she was going to trip. She could barely see!
And yeah. It's fake. You only have to look at her hair length at that baseball thingy with Harry in June (black dress, black flats, you remember) and the off duty day at the cricket grounds with Kate in July. It had shot from armpit length to waist length in the course of 4 weeks.
But it's just an observation. You may be sure if I was in the RF there wouldn't be a single solitary original strand of hair left on my head. And like I said, it's a very expensive looking weave and worth every penny.