Hi. Welcome. I am a Licensed Master Social Worker with more than 20 years experience working with individuals and families on a variety of issues.
I have a concern that if you reach out to her in any way that she may go right back to the chief of staff....do you think she would do that?
since you have a long standing working relationship with this nurse, i might suggest that you speak to her in a calm and gentle manner and let her know how it hurt you that she would not have come to you first to talk with you about these issues. The trust between Doctor and nurse is very critical and if you feel safe enough to speak with her about your hurt feelings so that it can be repaired, that sounds like the way to go. If after speaking together you feel that there is too much damage to have a good working relationship for the best interest of the patients, then you will have some thinking to do.