Need Help Building Confidence

I am the charge nurse in an ambulatory surgery center, and we just hired a nurse for the pre-op area (she is NOT a new grad). She came from ER and ICU and I thought she would be fabulous. Her skills are okay, but she REALLY lacks confidence. She is timid and if one patient raises their voice to her she gets really bothered....I just don't get it as she worked ER and ICU...oh well. She has trouble even deciding on her own where a bed should go....arghh. Pre-op is a fairly easy area for what we do and I was wondering if anyone had any confidence building exercises that we could use to help her out. She has a great attitude and works well with everyone, so I would love to try everything we can to make this work. Any ideas??? Thanks!!