I think this is the way... OP is already doing the things that can be done. You could try to educate more on how to do things right instead of trying to block

I think this is the way... OP is already doing the things that can be done. You could try to educate more on how to do things right instead of trying to block anything that might freak her out, e.g. searching for pictures only on curated sites like pixabay. However, basic filtering (adblock, kagi, DNS filter), trust and communication are the only things required in my opinion...