This reminds me of the huge manuals I used to make for my mum whenever I had to leave her in charge of her grandchild, explaining how to use my BT TV thingie to get to the various places to find the programmes that might be requested.
I mean you’ve presumably seen the document I did for how to Moderate DiS so you already know the sort of thing I’d do, lots of drawings and stuff.
I set my mum up with an Android tablet first and it was mostly just a question of setting up the home page to have the icons of all the programs she needed. Unfortunately Samsung made it very hard to delete a lot of the stuff that came with it but as long as it was all on the main screen it was normally fine.
I suppose your main thing is how is she going to get the link to a particular Zoom meeting? I guess you’re setting her up with a Gmail or something at the same time?