Feel for you with this.

Last year I had a short stint working. I was using FDC for both girls, and DD1 also had kinder. Thankfully she did not charge me for the hours DD1 was at kinder and she could have technically charged me an extra fee per pickup/drop off. I assume she was fine with it as DD2 was in her care during that time. Technically she could have had another child during in her care during the kinder hours. I know there were a number of days where she was juggling a shift of kids during the day, then the after school care. She was a bit funny when I did cut back hours from 5:30 to 4:30.

I don't think it is fair for her to charge for the weekly sessions when your DD is at kinder, but it is probably fair for the session that is not every week. It would be rather hard for her to fill a day on alternating weeks.

Best of luck. I always hated discussing money with the FD carer, I find it much easier dealing with LDC.