I had a thought about Rey lifting the Rocks at the back of the rebel base on Crait …there are real world examples of people having enough adrenaline flow through them and enabling them to do superhuman feats like lifting cars in an emergency to save a trapped child etc. I believe it was something like this with Rey , everyone she held dear was trapped in that base and in immediate peril so adrenaline rush +the force =superhuman feat x 10. She did not have time to hesitate or think about whether she could do it or not , unlike Luke when lifting the X-Wing on Dagobah in a safe and controlled environment .She believed she could do it , and did not stop to question it . okay , inevitable rebuttal in 3…2…1…
I like the explanation but we’re given no glimpse inside her thought process there. Because it happens offscreen we’re left having to assume what may or may not been going on in her head. Which would’ve been fine we’re she not supposed to be the lead.
(Not to mention, this is the point at which she should be feeling the most doubt in her abilities).