A pretty good question. Not only her but a lot of other professional politicians who never ran businesses or worked at real jobs. And there's nothing in the article that explains where and how she got all that $$$$$. Read the article @
Senator Warren Net Worth Revealed, How Did She Make $15 Million Within 6 Years As A Politician? - Conservative Daily Post
She's a published author (around 10 books), gets paid from time to time to appear on television and other advisory roles and I'd imagine she has made some bread doing business with those "evil" people on Wall Street she loves to demonize.
The story you linked doesn't account for all her legitimate income sources and doesn't present any evidence that she's doing anything illegal or unethical.
Is she a left wing dingbat, a hypocrite and a useless waste of air aka
a politician? yes
Is there any evidence that's she's earning money illegally or even in violation of Senate Ethics rules? no.