+1 to previous suggestions to making sure you check the Apple refurb store, and educational discounts.
RE software: Apart from Pages being included with all new Macs, which (like pretty much every word processor in existence) can open & save in Word .doc format, Office 365 is available free to students
https://www.microsoft.com/en-gb/education/products/office If she needs to use Windows at any point, Intel Macs can natively boot Windows 10/11 (because they literally are Intel processor PCs), Apple Silicon models (e.g. M1, the first of many) need the ARM processor version of Windows (not currently available for retail purchase but there are test versions) & can run that in a virtual machine. Compatibility with whatever she wants to run is a non-issue.
Would strongly recommend picking spec carefully. RAM and SSD are non-upgradeable on current portable Macs. Apple's not alone in doing this- many portable systems from many manufacturers are the same (why most models are so thin...). An 8GB RAM model will probably be OK for most tasks, but 16GB will be better for anything really demanding. You might (operative word) pay less for (say) a Dell or HP, but beware. Dell's webstore seems purposely designed to confuse and 'upsell' product to the bewildered punter. The cheaper systems have pathetically underpowered processors and hard drives, not SSD (Windows 10 runs like a sloth on valium if installed on a hard drive). HP- slightly better…Apple's certainly got form for this (the base model iMac currently on sale is obsolete, overpriced…). If you're really comparing like with like, easier said than done admittedly, the 'Apple tax' is much lower than sometimes claimed. And let's face it, she doesn't need a new laptop for
work, does she? The 2009 MacBook I'm typing this on would probably do her fine most of the time. However, rather you than me to suggest that!!
Were it me, buying now for a hypothetical student daughter: M1 MacBook Air, 16GB, 8 core GPU (fractionally faster graphics), 512GB SSD.