Sorry, I still don't get it. She said she is serving prepared mac and cheese. She will need to put in the oven. Storing the left overs should not be a problem. It sounds like this is a large daycare, with a parent room, etc. The menus are probably posted.
There will probably be limited left overs, hopefully the menu was made with allergies in mind. If you have questions, ask in the morning.
It will work out. Day care should be run perfectly, with all staff knowing the kids, etc. HOWEVER, this is not how it happens, people call off sick, staff is moved throughout the day. Staff is moved to meet ratios, etc. Most things the parents don't even know because they aren't there. Really, typically it all works out.
