After much diliberation I decided to not even respond to the email. I remembered that this parent had the mysterious problem of never getting the emails I sent her (yeah right), though insisted on emailing. It was yet another issue with her that was very frustrating. So I thought "screw it, I will just pretend I didn't receive the message." Not even worth my time.
But on a more positive note, I signed on a new full time family for September since my daughter will be in full time kindergarten ( and therefore leaving me with a preschool spot vacant). So the money I will get from that makes it not necessary to look actively for any school age kids. 1 full time spot is pretty much equivalent to 2 before and after school kids. So yay for me!