I think I put my question in the wrong forum.
http://paizo.com/threads/rzs2qbpl?Trixy-Witchy-Spells
Summary of the problem:
Is there a way/formula/chart to determine how many "known" spells a high level witch should start with? Coming into a game midway though at level 12.
Witches automatically get two spells of any level they can cast at each level just like wizards. If I were your GM I'd use the spellbook costs from Ultimate Magic as a guideline for how much to charge for additional spells beyond these.