Not really a movie, just some guy followed her around a bit before she went to prison. She isn't inherently interesting, just I think people are fascinated by a twisted mind like this. Especially because the documentary/whatever apparently doesn't paint her in a good light, and she still allowed it. Delusional from start to end.

Surprised you'd never heard of Theranos before though. ColdFusion did a great short doco on it.