And what nurse? Reiko Onami is a xenopsychologist, a doctor in her own right.
As for her attitude, she learned to appreciate him more in the course of the novel itself -- and let's not forget that McCoy himself learned that she had a point, and committed himself to correcting the deficiency she called his attention to. So there's nothing to make amends for.
Noted. She still acted kinda cruel to him, though.... and in the end, no real apology....
Frankly, I liked how in "Disaster", Ensign Ro said, "Commander, I was wrong.", to which Troi replied, "You could just as easily have been right."
Well, maybe it was a pride issue. Maybe she still thinks McCoy unfairly took Chapel's job away...