Can they do something useful like destroy the debt infrastructure and delete all student loans and medical bills?

Log in as her on your device. Delete the history, turn off ad personalisation, unsubscribe and block dodgy stuff, like and subscribe healthier things, and this is the important part: keep coming back regularly to tell YouTube you don’t like any suggested videos that are down the qanon path/remove dodgy watched videos from her history.

Also, subscribe and interact with things she’ll like - cute pets, crafts, knitting, whatever she’s likely to watch more of. You can’t just block and report, you’ve gotta retrain the algorithm.