I guess at the end of the day you have a right, as all clients do, to not attend a session. It may have been best to just tell your therapist that you couldn't attend (without the rest of the details), as it may have came across sounding wrong to her. I can understand that you actually let her know you didn't have the money to attend and it was her choice to decide to go ahead with the session, knowing she could trust you to pay at a later date.

I am probably thinking of it more from the T point of view....if someone regularly saw me, I might feel a bit hurt that I was putting in time and effort to help someone and they let me know that buying something was more important....but I'm sure you didn't mean it that way...it was just a case of money and timing.