Jane’s defining moment occurs when the mental barriers placed in her mind by the scientists begin to fail. This culminates in a specific incident where she realizes that the memories she has been "reliving" during her seizures are not hallucinations, but the actual stored memories of the previous Jane Eyre.
Based on the context of "Jane Rogers" and the phrase "defining moment," you are likely referring to the character from the 2017 science-fiction novel "The Body Electric" by Beth Revis (or potentially confusing her with Jane Eyre , a common mix-up due to the name).
The novel, which explores a 19th-century religious cult, was dramatized by Rogers herself into a BAFTA-nominated BBC series .
Rogers' defining moment had a lasting impact on her research trajectory, influencing her to: