Just my two cents here to mention that it's necessary to see this as a journey and a mindset, not a single-step or one-size-fits-all panacea.
If she's annoyed of advertisements creeping up, introduce her to adblockers and slowly make her get used to it. If she has shared concerns after seeing her friends or colleagues receive abusive comments on their social media accounts, comment on the dangers of oversharing one's private life and its potential consequences and tangible threats, like medical insurance companies abusing the info, and so on.