I have always been curious about this. Did you get them to use other services or did they stubbornly refuse and you just accepted it? I am talking using Chrome, using Windows, using social media like Tiktok or Facebook or Instagram, etc. Bonus points if you have kids because that is even more work in the privacy realm
First of all, I try to offer her alternative and better ways of doing things. I selfhost a number of services that we both use and she also knows that she can come to me for advice and technical help.
I also got her a hardware key that is used together with a software password manager, to keep her passwords safe.
We also have a rule when it comes to social media. If she wants to post a picture of me, she needs to ask permission first.