Offline? The lady has a tech-startup in SanFrancisco.
Untracked? Still possible to track her. There is nothing you can do to prevent it. If you want to buy a house, you're going to need credit, if you want credit then you're going to be tracked. That's just the way it works in developed nations.
It is one thing to be mindful of security. Protecting your data, understanding the limits of cryptography, not giving away important information via social media or to people who don't need it, is all important things to know.
In a digital world you leave behind a digital footprint. Having one isn't the problem. Controlling it is.
edit: Being untraceable is impossible and a thing of the movies. The moment you are born and issued a birth certificate, your digital footprint has started.
The thing to remember is that isn't a bad thing...