a giant red flag,  I can't imagine any veteran hobbyist booking under these terms in the first place.  B & S is such a common problem, you have to give kudos to some of the ladies that say in their ads, "If I'm not the girl in the photos you are free to leave with no hard feelings."  This quote of yours seems just the opposite.  

It's pretty common to have cancellation fees.  I'm not sure I see the issue.

She tired of the trolls. But that's too simple of a conclusion. So yeah let's go with her being ugly.

..... advertises on the prevalent site in her city.

 Her website and her advertisements always have current photos that show who she really is. She is beautiful but she has had idiots show up for appointments, and for whatever reason, have turned and left right away.  

She ran a couple of ads saying what the provider in the OP had said and the blow back was nasty on that board. But, it did seem to stop the shop and run guys.  

She is really comfortable in her own skin and just moves on. But, she just doesn't understand the fools not doing the research they should. And the waste of time and money that these fools cost is unfair.  

As a retired friend used to say on her ads "Don't be a fool, use your tool!".

Personally, I haven't walked into any session and been disappointed with how the woman looked yet. Research is my friend.  

I think a lot of us have run into a B&S gal, or been underwhelmed by a seriously over-photoshopped provider. It's one thing to have a cancellation policy; it's another to have it written this way.