One thing that I saw at a closed meeting was the secatery of the meeting made an anouncement that one of the people present was a visitor/non-member and that if anyone had an objection to that then they would be asked to leave. No one objected.
But if it is possible I would just take her to a open meeting. To be honest, I don't even pay attention to the fact that its a open or closed meeting. I just go and hope no one from my outside world is there to recognize me.