Point of view

I'm having a bit of a problem with point of view in my story (the vah shir). It comes from an omniscient narrator which is necessary because the reader needs to know things about Katrina that others dont know. I am having a hard time adding in the conflict that Katrina has between good and evil. I know, it should be especially easy with an omniscient narrator, but I just can't figure it out. I'm wondering if it would be too jarring if i switched the narration back and forth between Katrina and this all-knowing narrator. Maybe that would help show how senile she is. I hope I can figure it out soon because this problem is blocking my whole writing process.