Doesn't really sound shady but hard to tell without being there. I can tell you as someone trained in popping backs, straddling you provides great leverage especially if she was much smaller. When I had ortho clinicals (only time I've done manual therapy), if I could have straddled patients to pop their backs, I would have.
I'd just chalk it up to her being comfortable with bodies. These people see body after body all day and you may have read her lack of hangups as something it wasn't.
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