You see this as deceptive, as in, she deliberately set out to lie to you about what was going on. My guess it that was not the case. I really doubt that she had some sort of evil betrayal in her schemes. In fact, I don't think this was even a scheme. Life just fell in her lap this way and she decided to make a change. In this case, she was offered a position that she apparently found interesting and decided to go with it.

Her decision wasn't against you; it was for her and her family and her future.

I know you feel betrayed, but that is not the same as actually being betrayed.

You've been dissatisfied with this long-distance therapy for a great time. Perhaps this is the signal that it's time for a change. Hope things settle down for you. I know you are feeling unsettled.

Sounds like she experienced a change in life plans that she didn't predict and rethought what she wanted to do. That's pretty normal behavior for all sorts of people. We set out thinking things are going to happen one way, and we really think and believe that with our whole heart . . . and then. Something else lands on our path of life and we choose a different road because it appeals to us for some reason.