I don't feel guilty for having the appointment and taking a slot because she is not accepting new clients. I pay her for the appointments. I do sometimes feel mildly guilty because I have the highly sought after on evening appointnent she has. That is because I started seeing her when she started her private practice.
My guilt comes more from when I think about how much money I have spent on therapy. We could for on a vacation each year with it. Even when money has been tight and I suggested cutting back on therapy my husband will not have it. He feels it is an essential for me and our family. So we would cut a lot out of our budget before I cut therapy.