I too have thought that some (or maybe all) of her antics have been manufactured drama in the hopes of getting likes and clicks. And that leads me to another hypothesis that y'all can shoot down and flame me over. (this is the internet

)
Suppose most of this HAS been manufactured drama, and we know she's been riding this "autpilot bad" thing for a while. Oh no, what's it doing? Where's it taking me? Whatever. But, this line of videos was coming to an end, she was headed to the avionics shop for a new autopilot. No more milking vids on autopilot bad.
So, maybe she wanted to make that last flight to the avionics shop very dramatic. Maybe those altitude excursions towards the middle of the flight weren't bad autopilot, or even bad piloting. Maybe she was doing that on purpose, and somehow either broke the airplane or found herself in an unusual attitude that she couldn't recover from.
Yeah, I have an active imagination, but at least someone else must have had this thought.
Roast away!