i think it was hard.my party:
paladin
fighter
thief
mage
fighter/mage
druid
my bolts and arrows are ineffective for her.so i cast all the spells with my 2 mages.my druid casted boring bettles.they were useful.her acid resistence is low.and they stunned her.so i started to hit her with all my party.i killed her,but my party was nearly at the end.(their health were so bad.)while my druid started to heal my group,yuantis appeared and killed my thief!oh,that was a really stupid thing.(snake woman didnt kill me,but her yuantis did

)
and i couldnt search the boxes(so many).i returned to kuldahar and visit the priestess.and got my elven thief back to life.and i went dragons eye again for the treasures.what a story!!!