did she tell you to leave or did you just decide to because another guy had turned up?
because you changed the time, she might have thought you were not going to turn up and provisionally booked someone else in. how do you know she would ask you to leave and see him? she might have said to HIM something like - "no he has turned up so sorry i can't see you" and then continued to give you a good service. i don't know her at all - maybe she wouldn't have, i have no idea but from what you have written, it sounds to me that you were a bit premature in leaving!