Whenever a parent changes the drop-off/pick-up times, I have them sign a new contract stating what they told me. That way I have it in their contract if they are late/early whatever. Even though this was only for 2 days a week until August, it was something you counted on and her being late caused you an inconvenience. Talk to her and see if she still wants to do the 2 early pick-ups a week and if she says yes, then have her sign a new contract with those hours. If she says she doesn't need them anymore, well then at least you have a definite pick-up time.

Reply