Ok, I have this dilemma and I'm asking for some feedback. I have a family that has been with me for a few years and are really great. Over the past year, the dcm has had every other Friday off, but still pays the same each week. So, because her schedule is always alternate Fridays off, I will make dr.'s appointments, etc. on those days that I know they won't be here.

Well, this past week I got an email from her, last minute, saying that she needed to bring them for a couple of hours on the Friday, because she has to run into work for a meeting. I had made an dr. appointment for myself weeks before for that day and told her that I was sorry but I had an appointment that day and I couldn't watch them (it was out of town so I wasn't sure when I'd be back). She proceeded to tell be that "wasn't she paying for this day anyway?". I told her that this was her schedule and how I make appointment for those days, etc...
She just thought that because of the situation, she could use me as a drop in centre.

Was I wrong in how I handled it?