I’d start with a cell phone first. The last thing you want to do is give up your life to google and microsoft. Get yourself a graphemeOS compatible phone and replace all the apps with open source solutions. There is a (very very brand new) app called Vela Maps that acts just like google maps, only you can choose not to talk to google servers when you do.

Use sync-thing to auto upload photos to a server you control, even her home PC

There are ways to change the linux desktop to look like apple, though I don’t know what they are. possibly KDE?

unfortunately only google pixel tablets work with grapheme OS. There are tablets that are compatible with ubuntu touch

As for the watches, I don’t know of any that are de-googled.

None of this would be a problem if they weren’t taking your queries and feeding it back into the system. Just stop trying to harvest the input from “abusive” people, you don’t need to ban them. No other tool in human history needed this. Its like telling you that using a hammer to open a pickle jar is making hammers worse everywhere else on the planet.