I was thinking the same thing Honey. I know that at the barn I'm currently at there were two horses just 'left' there and the owner just leaves them....Honestly, I'd buy one of them. A cute mustang pony that if anything, would be WONDERFUL to use for kids who just want to groom and ride around on his back while being led or on a lunge line or something. I just LOVE that pony even though I could never ride it lol
Ok, that was off topic..-coughs- sooo, back to the topic!
I would personally make sure that the other boarding facilities knew about this woman's issues, and make her want to leave.
If you have good contacts (vets, farriers, friends, other facilities, and a good online web page or one of those google things that have user comments) then you shouldn't worry too much about what she might say.
Good luck in whatever you decide to do ^_^