The only two logical conclusions can be..she has some hair stiffening compound on it and does this for a bit of fun as she still relives her punk rocker days and she is free to do this in the space station.
OR.....
She has some hair stiffening compound on her hair, because she is faking being in the space station in zero gravity and is playing a mix between a zero gravity plane and also a green screen.
What seems more likely?
First of all, to me the first is more likely because of the huge amount of other evidence of the space station being real.
However, I notice you ignored all of my post except the part about dirty hair (I don't know about you, but my hair gets a bit stiff when it gets dirty, and that's long before it's a "greasy mop"). What about women, my mother included, needing frequent brushing and conditioner to keep their hair from looking fairly close to that even here on Earth? Also, some hair is naturally curly, so hair itself has some stiffness. If not pulled down by gravity, why is it so strange that it would instead stick somewhat straight out? My hair sticks out fairly straight when it's short. As it gets longer it's weight pulls it down. If I was in a weightless environment what would stop it from sticking basically straight out like in the video?
And also, even perfectly clean, my hair will be a bit stiff if I use crappy shampoo (at a cheap hotel for example). Enough that it can basically stand straight out even against gravity. So, why is it that hair in the video so absolutely unbelievable to you?
To your "logic" it seems like undeniable proof that the ISS is a hoax. To me, it seem to be behaving pretty much like hair does, and would be expected to behave in a virtually weightless environment (particularly one without the benifit of hot showers).
Either way, you seem almost distraught by the mere thought that someone could believe that hair looks how it would under the supposed conditions of the ISS. So I don't suppose there is much reason to continue the discussion.