So is her blog hacked or is this someone impersonating her?

I also generally don't understand her background, and I see this quite a lot with Silicon Valley backgrounds, so it's more of a general commentary on these types of backgrounds. She went from being an engineer for just three years out of school to founding a consulting firm, publishing company, and publishing books on cracking code and project management interviews. How does that jump happen? Where do people like this get the experience and expertise to write books like this and consult despite only ever having one full-time job before jumping into it?