If you'd like a parent perspective (I'm not a provider), my advice would be to smile, keep it professional, and spin it as a benefit (which it really is in the long run, IMO, she just doesn't understand that yet). Assure her that it's not just her and that your goal is to better everyone's daycare experience without raising everyone's prices. Tell her that clarifying policies like this (spelling out vacations, late fees, etc.) will make it
easier for her to know exactly what's expected so there aren't any surprises and the perks are distributed fairly.
If she wants specifics, let her know how your policies are benefiting her and her kid(s). It's tough on her little Johnny when another kid brings a Pop-Tart and he doesn't have one. After so many hours in care, the kids start to get cranky and the Go-Bots start to fly and Johnny gets handed back off to Mom starving to death and wild as a goose. Sure, there are times things just can't be avoided, and you understand that (which is why you've worked it in), but it takes more of your attention and effort to do so, hence the charge for those services.
It's clearly for your benefit as well, she says? Of course! No DCP works for free (that isn't your mama) -- the rules, the vacation, etc. are all part of the 'package' that you have to consider when shopping around, which she's welcome to do. Based on the research you've done, though, these kinds of policies are fairly common.
