An Amateur gets a boarder

I have a couple of my horses advertised and I have a little info about my farmette with a few of them. I don't advertise. Somehow, every now and then, I get a call from someone who is looking for a horse to be trained or lessons or guided trail rides. Since I only have two saddles, I can't always accommodate. But I try because who doesn't like money?
Right now I have no beginner horses. The gray, Silvie, comes close but she is no way capable to teach a beginner how to canter. It's an ex-race horse with trash can training that has made it that way. Plus if you do something wrong enough to piss her off she will plant her feet and I don't think even a cattle prod would get her to move. She's a horse who demands respect of her rider and expects you not to push her past her level of schooling. She's a great horse to ride when you keep this in mind. I have tried pushing her a couple of times for something she had not done in months and she very sternly told me it wasn't going to happen. I went back to doing what we were doing before and she was as happy as a clam.
I sold my one lovely every person horse because I wanted to buy a lovely unraced broodmare, Nifty. My perfect horse died last December. I have never come across a horse as well trained as her or as loving of her rider. Dan is close, but he is still a stallion so it's a different feel from a mare even if the training is the same.
Anyways, today I received one of those calls. Someone in Jasper, a solid 45 minutes from my house and five miles from the state line, has a Quarter Horse mare they have lost control of. Something I learned a long time ago from my good old cowboy days with Ray Hunt is the uneducated will blame the horse and tell you what the horse is doing wrong rather than the horse is reacting to something they are doing wrong. These people were really no different. Not complete novices but there was a bit of 'personal feelings' put in about how the mare is treating them when they handle her. From what it sounds like the mare is smart and she figured out through her little tests that a lot of people ignore that she could have her way if she kept at it long enough.
Anyone who knows me will tell you I like a very smart mare with some sensitivity. This girl sounds just fine.