Nice post, and I agree. She would be dumb is she actually believed her stuff. It can happen, however, that you (or other "competent" nurses) exacerbate the problem by getting on her case about everything. I had a preceptor like that, and it was horribly irritating. It's easier to make stuff up than to deal with grief from coworkers. Whatever the case, let the learning process occur. If she doesn't learn, then she won't last long, but don't feel so important that you start to believe you can do something about this nurse's habits or personality. Go with the flow.