I agree with Hooligan 100% about this being psychosis and not lies. It sounds like what you are describing (you said "delusional type symptoms") and when I (or anyone) am psychotic it is impossible not to believe my own reality. If my thoughts agree with reality, well then, I am not be psychotic. Even if she is not psychotic, irrationality is sometimes an unrestricted symptom of mania. I know when I am manic, if I believe something to be true, well then, you better agree with me or get out of my way. For instance, if I want to go for a drive and I'm manic, my husband will always tell me no. Well, I will believe him an evil bastard for standing in my way when in reality he is trying to protect me from driving 90 miles per hour for hours at a time.