... to see things from her point of view. My own life experience has been when someone I've never met warns me (s)he might be ten or fifteen minutes late, I had better plan on waiting 45 or 50 minutes. And any complaint that the delay was excessive gets met with a shrug. Having warned me, (s)he feels like there is no further obligation to be timely.
If the lady in question had similar experiences her response to you is understandable. If you are worried about traffic you can just leave 10 or 15 minutes earlier and then, if you arrive early, find a way to pass the time. Kind of boils down to the question whether your time is worth more than hers, and you are each entitled to your own opinion on that.
So to answer your question, you were not unreasonable in politely cancelling the session when it became clear your views on time value differed. But you are completely unreasonable to declare, based on nothing, that she books men so close together there's no time for clean-up or simple hygiene. You say she's well reviewed so it's far more likely her schedule is rigid to make darn sure there IS time for hygiene and a little recuperation so the next client also gets good value. You are disappointed and annoyed that your planned session didn't come off. Fine. That doesn't mean you get to trash her, even in your own mind. Well, you do, actually, but don't pretend it's reasonable.
And it is unreasonable to declare, based on the little you have said, that she screams clockwatcher. A clockwatcher is someone who starts moving you out the door 52 minutes into the session to make darn sure you'll be gone at 60. I don't see any real hint of that in her response to you. Equally likely, her scheduling includes an extra ten minutes so she can ease you out the door when it's done. But if you waste those ten minutes (or twenty, or thirty) by arriving late, suddenly she has no choice but to become a clockwatcher or risk offending her next client who did nothing wrong. A woman who tells you it's important to be on time is just a businessperson.
My response might be somewhat different if I had not been told by three different women in the last two weeks that the level of "stupid" has been rising fast in Minnesota, lately. And timewasting has been a major part of that "stupid."
Those are my views but I can see I'm in the minority here.