I always thought there were two possibilities here:
The charitable one: That she had a what if moment. What if we could come up with a technology that would allow us to diagnose a huge number of diseases from a tiny sample of blood. Now there are plenty of doctors and scientists who could tell you a whole number of reasons why this would be hard, but being charitable maybe she thought it might be possible. Maybe it came from a misunderstanding of how this shit actually works, who knows? But the pressed ahead anyway. Until the investors money ran out and the project was no further forward. And then naively she decided to get more investment because surely the quantum leap was right around the corner. Repeat until the investors have had enough and they call the cops.
The uncharitable one: She's a con artist.