Is her hair magical or something?

In the movie, her hair is always braided and neat. She's in this fight to the death arena, yet her hair is in that perfect braid.

Also, in the Hunger Games movie, her hair is brown, but in Catching Fire, her hair was black. Then, in Mockingjay part 1, it went back to brown. I know Jennifer Lawrence had to dye her hair, but why bother dying black in Catching Fire? I mean, the dye could've screwed up, but that's what bleach and redying is for!

Anyway I am now convinced that Katniss has magic hair.