Concretely, what should she have done differently?
If there isn't enough marketing advice out there about finding as many channels and methods as you can, I'll eat this comment with barbecue sauce.
Read up, utilize all the advice on everything except Google-owned properties, accept the lower visibility, and help neuter the algorithm beast.
Or accept that you're riding the tiger and never complain again.
The advice is all there, all right. It's just that most of it is "join a platform that's NOT being used by literally everyone on the planet", which is not very effective when "literally everyone on your planet" is the "raw material" that you fish your viewers out of.
- while building up your following on google, market your brand to your own site(s) as much as possible
- build brand an alternate streaming site(s)
- have a way to reach your followers in the event you get shut down - email list, etc. to inform your followers to switch to the alternate site