This could all be fixed if it’s revealed she had a bit of training as a toddler by some forgotten survivor of the Jedi purge. 😉
I’d find that neither satisfying or necessary.
Unless knowledge of how to use the force transferred to her from her mind link with Kylo, the simple fact that she on her own thought to use the Jedi mind trick needs some sort of explanation…unless I am forgetting something.
I suspect that Kylo UNLOCKED her force powers during the interrogation scene. Her force powers were sealed by someone who left her behind on Jakku. A planet so remote that even old Luke Skywalker admitted that Jakku is pretty much nowhere. But who was it? My guess: it was Reys mother. When Snoke was actively looking for young untrained force users, Reys mother hid her on Jakku never to be found by Snoke. Snokes search was successful though: he found Ben Solo.
I’m really hoping we will see Reys mother.
All I take from what Kylo told Rey (and the best way to get someone is by saying something true that they don’t want to hear) is that Rey’s parents were no one of significance. That does not mean they were not force sensitive. It just means they were not Skywalkers, Kenobis, or anything else. Star Wars has established that there are force sensitive people throughout the galaxy. The Jedi only trained the ones that they found when they were young enough. Your theory about Rey’s parents locking away her powers could be very true. It would be a way for Abrams to revisit them. But I think it is important that they remain nobodies. But a family where the force occasionally ran strong would not be out of place.
I wonder if one reason the force was out of balance was that when we see the Jedi in the PT, they forbid Jedi to have attachments. Anakin and Padme’s relationship is forbidden. So it is likely that all these Jedi who are not having children is ending many lines of powerful force users and diminishing the force in the Galaxy. Somewhere along the line, the Jedi decided that attachment could turn Jedi to the dark side and forbade it and as a result their powers were weakened. So that is one of the many things that the New Jedi need to undo. Luke obviously didn’t in the canon universe like he did in the Legends universe. I found the Jedi to be one-sided. The Jedi and Sith were polarized. The new Jedi needs to not be. I feel that the Jedi of the PT were incapable of knowing how to stop someone from falling to the dark side. They just forbade every avenue and emotion that they thought might lead there. Basically dark side abstinence. And like with sex, abstinence doesn’t work and when the temptation comes along, that way lies an easy fall.