What did she say about the first time she didn't show up for an appointment? That is a pretty big faux pas on the part of a therapist and demands an explanation really. It simply isn't acceptable for a therapist to not be present at an appointment and give no reasonable explanation. In this instance "I forgot" is not an acceptable response. A therapy appointment is a therapy appointment and therapists are accountable to their appropriate ethics and governing bodies.
So what was said about the first time this happened?