Ground zero of your position is the premise that you are actually capable of maintaining privacy despite the growing arsenal of Facebook, Google, Apple, Microsoft, Amazon, ATT, Comcast, etc. [1] while your attack surface is ever expanding. [2]
Random relationship advice from the internet:
The decision to tell one's lady friend that she is using her iPhone wrong suggests a disposition to pursue unwinnable battles. In terms of privacy, your lady friend's pragmatic approach may be less satisfying, but you may be better off accepting it than tilting at windmills. Trying to stick it to Google is an identifying data point.
Good luck.
[1]: Never mind state actors. Mind browser fingerprinting.
[2]: Your social graph leaks information...the business that uses gmail, the colleague who loads their contacts into Linkedin, the FBfriend who shares a link on your timeline, and everything else that allows triangulation.