Hands down a coffee thermos and a drink bottle. Because she'll likely not finish her coffee and it will go cold, so a thermos means it won't!

I have a basket I use to take from class to class (secondary teacher here) which holds all the stuff I need for classes. It's actually a bike basket I think, but has held up super well. Just handy when I don't have a set classroom.

A second monitor for home or office is a good one too. I refuse to work on one screen anymore. So much faster with two.

Subscriptions to things she already uses. I particularly like a website called twinkl (the first thing I have ever paid for - everything else I decided wasn't worth it). Magazine subscriptions are good too.

A great laptop bag. One that is wide enough to also fit a lunchbox. Bonus if it has a removable padded pouch for the times when she doesn't want to take the whole bag.

A good umbrella (davek is the one I have) and some warm clothing for those horrid days on yard duty.

Comfort shoes that look cute (I've got ziera).