So sorry to hear that you were lied to by the dealer about your mare.
It sounds like she is in a good place now though. Good luck with your restarting, it sounds like you are off to a good start!
I too have been doing a bit of restarting my own two horses. I had done all of their training and had started them both under saddle several years ago. Since then I have learned SO much more. I finally decided to more or less start over with them to fill in some holes left by me not knowing things back then. It's been fun!