Use ber.tags['Ghost']['PossessedSkills'].pop() and one of the previous commands to fix her. Alternatively, wait for the next update. Idk. what went wrong, but I'll try to find out.
As for her having holy skills, the difference isn't that big between healing and necromancy in the game's setting. Healers don't play with the soul and corpses in a bad way, but can. Hence you can use holy spells on the undead (healing, regeneration and so on).