Some may not be relevant:-
If your school has an online portal to top up dinner money, see timetables etc, get familiar with it- and top up dinner money. Some do it before day 1, others on day one, depends on your school.
If she’s going by bus- Make sure she has money, bus money/bus pass, knows where to get on and off the bus, and what to do if she misses the bus, loses her bus pass etc.
If she’s taking a phone, that she switches it to silent before going into school.
She has a water bottle full of water, nerves can give a try mouth. And a cereal bar or snack in her bag in case she gets a rumble tum. Maybe some mints to suck.
That if she feels unwell, she knows where to go.
If she’s lost, to ask an older kid. 99.9% are brilliant. When ds got lost on day 3, a 6th former walked him all the way to the classroom, and explained to his teacher why he was late. He realised they weren’t scary after all!! Now Ds is doing the walking and explaining!
That’s it really for day one. Going forward, you have a copy of her timetable to easy access. Remind her the previous night for games/ PE kit, and any musical instruments. You keep any eye on what they eat- many get over excited with choices and blow a weeks worth of money in 2/3 days 😡can you tell I went through that?. Make sure school has the correct email address for you, and you inform them if you change it, or you will miss out on a lot, judging by the emails we get each week!