Wow, I really seem to be in the minority on this one. How late are you talking when you say sleep in?? I stand by my first response that if it is over a half hour you are going to be paying for it later.
Don't forget, If you are sending her to a traditional centerbased daycare, they will soon be transitioning her to a Toddler room and they will have a higher ratio of Kids to teachers, and will most likely need all the kids to be on the same nap schedule, They won't have the ability to put her down for a nap in a crib any old time she gets sleepy.
do yourself a favor and keep her on her week day schedule. If you let her sleep in on the weekends it might be fine for a day or two but you'll end up paying for it Monday morning.
Kids do well with routines and schedules, If she is consistently sleeping past when you need to wake her at 7 to be to work/daycare, then you need to find a way to get more sleep in her day, or an earlier bed time.
seriously consistency is the key, she'll thank you for it later.