This is a little odd, but Nurse was stunned...presumably until the end of the chieftain's next turn...which came and went. Normally stun causes you to lose your turn effectively...but Nurse went before her time last round. So what I'm proposing is that Nurse not get a turn this time around, but the stun is effectively done after she skips her turn. So no CA, and she can take OAs, etc.
Will that work?