She's almost 70, spend all day watching q-anon style of videos (but in Spanish) and every day she's anguished about something new, last week was asking us to start digging a nuclear shelter because Russia was dropped a nuclear bomb over Ukraine. Before that she was begging us to install reinforced doors because the indigenous population were about to invade the cities and kill everyone with poisonous arrows. I have access to her YouTube account and I'm trying to unsubscribe and report the videos, but the reccomended videos keep feeding her more crazy shit.
You might also want to try watching a bunch of wholesome ones that your mum might be interested (hobbies, crafts, travel, history, etc) in to push the recommendations in a direction that will meet her interests.
This is a very important part of the solution here. The algorithm adapts to new videos very quickly, so watching some things you know she's into will definitely change the recommended videos pretty quickly!