Yes, Cerek is right. The fight is really tougher then it reads but you have one controllable thing out there - Bodhi is not capable of dispelling stuff! So you can BUFF like hell and stand mano-a-mano with her.
The biggest problem at the start is her cloud of bats thingie. I was unable to dispel it and it lasts very long. The character(s) who are under this bat stuff are in a big trouble. So the first pointer is that if you can somehow make her throw it on a summon or maybe on someone with many HP who will get out of fight and gulp potions.
After that she has some nasty spells (sepulchural sleep, darkness something) but they can be resisted or protected or healed.
What you need is someone with PFMW (and fully buffed) to stand against her while the rest of the party is attacking her from sides or from range.
And you have to do it twice since she heals.
