My Caregiver: When Late is Unacceptable

My caregiver... I am about to word vomit... she was late today, knowing for over a week that I had an important dental appointment today. She said she was late because the man ahead of her at the gas station took time to wash his windows. To me, filling the tank should've been done the night before, or she should've left the guys earlier this morning. She thinks she's innocent, because of the guy in front of her. I think, after 5+ years working together and having the exact same schedule for all of those years, she should be on time. I think I deserve an apology at the very least. I'll be discussing it in therapy Monday. This has been going on for about a year now, several times a month. Usually I do my best to let it go. Today was an important day. She knew that! If this had been an appointment-free day I would be cooled out already, but my appointment! *growling sound followed by years*