Interesting take on it...I had also asked James Jacobs (PF Creative Director) and here's what he had to say:
>>>"Here's how I'd answer them in my game:
--I would let the witch modify her hair's attack and damage with Int. Str wouldn't enter the picture.... [/QUOTE
would you happen to have proof James Jacob said this??? my TABLE is very raw and likes to under power some stuff if it isn't clear. But have stated if a person of paizo said it and proof he said it then that is how it goes. So any proof?