Except Rey doesn't become disillusioned with the concept of the Jedi in TLJ. It's Luke who has done that, because of his own shame. She doesn't even become disillusioned with Luke. She takes the books specifically because she never does. Because even after everything happens, she is still asking Luke to fix the situation.
In TFA Rey suffers from paralysis, do to the trauma of her abandonment. She wants people in her life, but fears not seeing her loved ones, so she stays put, missing out on finding new loved ones. She can't move forward, do to her far of losing the only thing she ever had.
The issue with Rey in TLJ is her "arc" is basically her same one from the first film, but with her taking a backseat to Luke and Kylo. Rey is looking for someone else to be the hero in TLJ, because she wants to go back to what she was doing before. Waiting and being insignificant. The issue with this is the end of the movie cuts her out completely. She does not rise above it all. She does not take the mantle. It is instead Luke who saves the day, while Kylo has big character stuff happening as well. This could have been helped if Rey and Luke somehow interacted during the finale. You know, like talked using telepathy or something, but they didn't. Same with having a relationship which would havae made his death matter to her.