It is a very shocking and disturbing case, and it was very very wrong of her, she deserves prison.
However, I do worry about the age of social media dating - especially in this particular example.
Arranging to meet up with someone without being able to guarantee who they are is very worrying, it's hard to say this without sounding like I'm blaming the victims (which I' absolutely not), but regardless of your fetish and interests, I think you should really be making sure you know who it is you are meeting before you consent to anything sexual. I just couldn't imagine being comfortable even going on a casual date with someone who expressly insisted I be unable to see them, even once, even on the first occasion of meeting them.
We need to look after ourselves because unfortunately there are sick men and evidently women who are willing to go to such lengths to take advantage of someone :(