I agree with the previous poster, you can always request it, but there can be no way to guarantee it. If your room hasn't been cleaned by the time you return, hang the do not disturb sign out during the nap so you won't be disturbed. After she's done napping, give housekeeping a call and see when they plan on stopping by then. I've tried this many times, having traveled to WDW MANY times with infants and usually I'm disappointed. Oh well......