C.D.
Sounds like you are off to a great start! Since she will have homework supplies at both homw and grandparent's homes it might be good to have a folder to put work in that stays in the backpack. That way no work will be left at the wrong house and not make it back to school.
Make friends with the office staff and show them appreciation when you can.
Always check the lunch menu or pack lunches from home.
Keep a spare set of clothes are school or grandparent's (if they can run them to her school) in case there is an emergency and you can't get away from work in a hurry.
Make sure you know the school's policy for recess and weather. I always hate for a kiddo to miss recess over not having a jacket or wearing shorts when they aren't supposed to!
Remind her that school is always supposed to be a safe place and that learning can be fun.
I'm sure you will do great! It's probably like riding a bicycle, and once you've learned you never forget!
Good luck!