Thank you for your speedy and helpful support. Unfortunately, I was forced to go to a Best Buy to have the system looked at, and I managed to squeeze this in with two medical appointments. I did not have an appointment with Best Buy, and I did go to the one Apple referred me to. Yet they were extremely understanding, and fit me in immediately, though they were backed up with similar appointments for over six hours straight. The supervisor said I looked like I was about to drop, true! Lol. And although it took over two hours for their consultants to finally do a factory reset, after running full diagnostics on the device as well as my battery, it was completed, and with very gracious specialists. I left with a finally updated iPad Pro, and some advice if I encounter certain future issues.
And all of this free of charge. I am not sure why, but they did this without any requests from me. I have to say I was impressed, and although today I can barely move, it was well worth the wait, and I think it helped that I was well armed with all the knowledge all of you gave me, and I thank you for that. It was obvious I had done my homework, and I gave this community the credit for that.......
They were not sure why it did not work at home, but at least they fixed it and with panache. Thank you again! ( we did wonder whether the fact that this one time I did not have data/cell on this model, but they couldn’t be sure. On that note, it is resolved. And without all of your most intelligent input it may not have been done at all yesterday.