Once you have it dialed you can disable your search/watch history.

Some of my personal hobbies/interests tend to appeal to the right wing tinfoil hat fringe (outdoorsy hunting/camping/survivalist stuff, ham radio, a casual interest in guns, and I have a small libertarian streak although I'd generally call myself a liberal these days, etc.) So left unchecked the algorithm will show me some crazy stuff. It used to happen to me occasionally that while I was googling around for info and reviews on some piece of kit I'd be clicking into different forums to see people discussing them then I'd realize at some point that I was on the stormfront forums (and immediately nope the fuck out of there) usually it would be a totally normal conversation of people discussing a ham radio or gun or whatever until halfway down the page someone would drop a comment like "in my opinion, every nationalist should own one of these"

So my YouTube history has been paused for years, probably since well before trump and q anon and everything really took off, and frankly I've been happy with my recommendations. I haven't looked too much into how those recommendations are determined now but it seems to mostly be based on what channels I'm subscribed to.

There is definitely more going into it though, because I get a lot of recommendations about the breed of dog I have despite not subscribing to any dog-related channels, so it's definitely pulling from the rest of my Google search history or social media or something, or secretly keeping track of my history a little in the background somewhere, so you'll probably have to do some pruning in the rest of her online accounts too.

Some things just completely skew your home page with just a single viewing. I am very careful with my watch history, only watching one off stuff from other sites in a private window. That seems to work well.

Another thing that I'd consider doing is to unpause her history a bit, put YouTube to play a few videos about other stuff (topics that she'd watch, based on her tastes, minus the q-anon junk), then pause it again. This might tell youtube "I want to watch this".

Side note: that's how mainstream media is making every single one of us flat and single-minded. So you watched X? Onwards you shall see X nonstop.

you can also go here: https://myactivity.google.com/product/youtube and set it to auto delete

I would not pause the history, i would populate the history with balanced contents and then (if you feel like your mother will actively look for radicalized content) pause it.

So that the algorithm will have something"balanced" to work on.

Re not acting immediately: per GDPR they can't keep deleted data on your activity more than a few months (and probably they do before the deadline)

Delete also the search history. After that, search non toxic topics, like live shows of her favourite artists, recipes, nature documentaries...

Video likes have an effect on the algorithm. If she has lots of liked videos, delete them. Any playlists she made would influence the algorithm too.

Not sure if video feedback data gets used, but you can clear them too. I’m talking about those “What did you think of this video?”, “Please tell us more” questions.

Edit: I’m not entirely sure if there is an option to delete the “likes”. You might have to manually “unlike” them.