I agree that this nurse was not terminated or fired. If the hospital policy is to have all references go through HR then all that HR will likely say is that she is eligible for rehire - and confirm the dates of employment and position held. They will not give a reason for separation from employment, too risky! As previously posted she should say she was looking for a change, or desiring more hours, a benfitted position or something like that.
Perhaps a bedside nursing refresher course would look good on her resume and help her confidence?? Just a thought.