Do you mean the 9.7" Natalie - the iPad Pro 10.5" only came out this month.
I got the 10.5" last week, it's definitely smoother and faster than my IPad Air2. I like it very much. I got the 256Gb version, because I have lots of photos and I like to download a lot of TV to watch when I'm away without wifi, but your DD probably won't need so much space. I haven't yet got a keyboard or Apple Pencil, but I'm dropping pretty broad hints to DH for my birthday in August!
One downside is that you can't get a case for it that covers the back from Apple, unless you want to pay £129 for the leather sleeve, which still doesn't protect it while you're using it. So you will want to have a look at the third party cases that are available. There are a lot about, I'm still trying to decide on one, in the meantime I'm being very careful and using a sleeve designed for the Microsoft Surface to protect the back. while travelling.
With document compatibility, you can download Microsoft apps for Word, Excel etc to read Office documents - you need an Office 365 login to edit, but students and teachers can get it free with an academic email - are you able to check with the new school whether their pupils can do this? The new operating system iOS11 that's coming out in the autumn has a new Files app, which will make it easier to keep all her school files together. Some schools use Dropbox or another online file facility, others don't because of technical questions about whether it complies with EU regulations on server security - is there any info on the school website about IT policy, or BYOD (Bring Your Own Device) policy?
As far as printing goes, the pupils at the junior school I work at print using a dedicated app for the printer we lease - again the school may have their own managed system, lots do nowadays, or you may be able to use an app from the App Store for the particular make of printer she will normally want to print to.