Her Momma didn't teach her the right way to wash her hair!
No, Helena, you don't smear conditioner on your scalp. You use it on your hair from the neck down... And no, I'm not meaning this in any 'dirty' way. :P
Seriously, though? Everyone's a little different but think about it.
Helena has fine (not fine as in good looking, fine as in type and/or texture) hair + If she used any type of products on it that day (hair spray or fizz control) + Stress/sweat/oil + She's been up all day and the events at Tall Oaks started in the evening/night + She was running around & fighting off zombies for hours through out the night = Your hair is gonna be jacked and looking nasty.
They only thing that could save her is a pony tail but then she'd be ripping off Claire's style. She most likely needs to lay off the product though... And get it cut differently.
On a completely different matter: Ada has no butt. Sherry has a nice one and Helena's is bangin'.