Rey’s transformation is NOT rushed because as I wrote a couple of pages ago:
Guys, am I taking crazy pills or did anyone not hear and see what was going on in that flashback? Obi-Wan says “Rey, these are your first steps.” Followed by the slaughter of the Jedi by the knights of Ren, followed by a shot of Rey being left on Jakku.
By using some simple logical deduction, Rey has had Jedi training and is being hidden from Ren. It’s when the force is used upon her for interrogation, that these repressed skills are awakened. This isn’t a “Mary Sue” moment where she’s suddenly able to do incredible things from nowhere. It’s different from Luke who had to start from scratch.