Wendy

Wendy was in a government project called Insight. The goal was studied people with special powers. They discover there a people with real psychic powers. Reading minds is just one of many powers uncovered. Telepathy, telekinesis, pyrokinesis and more were real. Their research reveals that if they get the subjects at a young age. They have a chance of keeping their subject controlled. Their research shows that almost all of their have psychological issues.
Paranoia being the most common. A few exhibit traits of possibly being a psychopath or sociopath. Wendy gets her younger brother out the project. She stay because wants to not only understand how use them. Two years later, Wendy just walks out of the well-guarded facility along with their subjects. Too late they realize how powerful Wendy actually is. Soon they find out Wendy is not done with them.