We got to the point in Book 2 where the party finds some spells unique to this adventure path. Problem is, all of her spellcasters just happen to be occult. I know this AP was written before Psychic magic was really a thing, so is there an update on what occult classes should be able to cast them and at what level?
Unfortunately not.
If it's the spells I'm thinking off, you probably won't go too wrong if you just based them off the levels given. Outside of the info for summoner.
I'd probably say Medium, Oculist and Spiritualist could cast them.
Psychic should have that 8th level curse.