J.J.
Kiddin Around or Adventure Kids both have locations in West Plano. They are both hourly drop in centers and have later and flexible hours. I have used the Adventure Kids in Flower Mound and been happy with them.
http://www.kiddinaroundplaycare.com/
http://web.adventurekidsplaycare.com/about.html
You could also check out a Mothers Day Out Program if you are looking for mornings. A few have summer camps that might work out for you. I use the one at Christian Life Assembly in Carrollton, and they do have a summer camp that will start registration in March. http://www.clife.org/