Thanks, mkc! I did hear back from her. She countered at $12,500, then reduced it another $150 because she wanted to replace the bobbin winder for me since the old one was having some problem. I believe she is honest about her machine and it's condition but I would feel better if it had a recent dealer check up and clean bill of health. I'm not good at purchasing used large ticket items. I'm just not experienced enough to know if I'm heading into a major repair nightmare.
I hope you get what you want, too. And have a great experience doing so! And I hope the info in this thread will help others in their decision making.