That isn’t to say she doesn’t have personal demons. We just don’t know what they are besides her parents.
And I still say Ren could have been lying. Someone more than Ren ought to know who they were. After all, Luke got confirmation from Yoda in ROTJ.
Of course, but Luke got significant development, by having to resist the dark side, learning that his father was Darth Vader, and losing a limb. I don’t see Rey really being challenged. She makes all the right decisions within the blink of an eye, lectures and defeats a Jedi Master, and the one thing that appeared to torment her in TFA, is made to seem a waste of time, risking her becoming a bland character, who’s only traits are being better, smarter, and more powerful than everyone else. I mean, how is she supposed to grow in the next film?