So as most of us know the White-Haired Witch archetype gives up the witch Hex ability, however the gnomes favored class option for witches gives her 1/6 hex a level.
Meaning that at level 6 a White-Haired Witch could gain a hex. Maybe I have not done enough research(or maybe searched the wrong key words) but I have not read any rulings on this kind of situation. So some quick clarification would be nifty.
Unfortunately, someone seems to have hexed you and your post has ended up in the card game forum, where the only Witch currently available is Feiya in the Skull and Shackles Character Add-on Deck. She isn't a Gnome, and I have no idea how the Pathfinder RPG works, so I'm not able to help you with your question. But I've flagged your post so hopefully it gets moved soon.
In the meantime, why not check out how awesome Feiya is? Look, she can reduce the difficulty of checks by characters at her location against monsters and spells! No more letting that bumbling Fighter crap out on his role for that spell he encounter that you've been desiring for the past 4 scenarios!
Anyway, I hope you get a an answer to your question soon. Good luck on that.
There was something a while baxk ago mentioning that you need to have a class ability for boosts to it work..and that favored class option only gives you a hex, not the ability to use it.
That makes more sence why it didn't turn up anything in the search X.x Thanks for the replay anyway.