There's no specific person named Janie that it's based on exactly. She is more of a fictional character created to represent victims of abuse in general.
I'm not sure specifically who 'Janie Bolitho' is within the context of 'Fantastic Fiction' without more information. It could be an author, a character, or someone related to the Fantastic Fiction world in some way.
There isn't enough information provided to give a definite answer about who Janie Crouch is in Fantastic Fiction. However, if we assume that Fantastic Fiction is a platform or a genre community, Janie Crouch could be involved in various aspects. She could be a contributor, like an editor or a reviewer. Or she could be an artist associated with creating visuals for Fantastic Fiction works. Another possibility is that she is a fictional character within a Fantastic Fiction narrative that has a very specific and perhaps not - yet - well - known story arc.
It could be that Janie tells her story to a journal. Writing in a journal is like talking to an invisible friend. She can pour out all her thoughts and feelings without any judgment. This way, she can also keep her story private while still getting it out of her system.
Janie's situation at the beginning of the novel was rather complex. She was dealing with societal expectations, a lack of personal agency, and a sense of being trapped in a cycle she desperately wanted to break free from.
It's possible that Janie confided in a trusted neighbor or a coworker. Maybe she needed someone outside of her immediate circle to listen and offer a fresh perspective.
At the start of the novel, Janie was trapped in a mundane and unfulfilling existence, feeling oppressed and yearning for change. She was dealing with societal expectations and personal dreams that seemed out of reach.