It puts you in a position where you have contact her when your not going to the meeting, so she know not to expect you.. You have to go straight home from the meeting...what if you're not planning to do that. It puts pressure on you because now her spirituality depends on you getting her there.
This is the elder's responsibility, not yours. They are the shepherds. This can go on forever after she is reinstated. What if you plan to fade?
Tell him your uncomfortable doing, it. Don't give him any extra explanations.