closed as primarily opinion-based by phantom42, Jason Baker, Jonah, Mooz, Ward May 3 at 4:00
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And a comment that it was,
voting to close based on our future works policy
I was genuinely very interested in why this was happening (what I asked in the question) and spent a few days searching through Wookieepedia, when I found a definitive canonical answer. I did not know that meta is where you post these questions I so I posted the answer inside the questions post. But for correct form. The answer should be in answer format ,have the edit removed and reopened for others to comment etc?
I am going to post a full answer as to why I think Rey used Psychometry and also had some of her own memories mixed in.
The first scene is Rey being transported by her vision to the halls of Cloud City on Bespin, from the novel,
she saw in the distance a section of the famed Cloud City. Two figures were locked in combat, distant, distant.
So obviously Rey was not there and could not have known about how the halls looked. This had to be due to Psychometry
In the vision we Luke’s hand touching R2D2. Rey could have possible seen this herself or used Psychometry, so it is inconclusive.
The next part is the Knights of Ren standing in the rain over the bodies of the slain Jedi. Rey could have also witnessed this herself or could be Psychometry, so inconclusive.
Then we see someone being killed by Kylo Ren. I don't know what this means or is indicating.
Then we see Rey as a child standing next to Unkar Plutt,crying and calling back whoever left her there. This is obviously a memory.
The last part is what seems to be a vision of the future, with Rey standing before Kylo in the snow. So this also being that Rey is seemingly looking into the future, cannot be Psychometry
Bottom line, she had no way of ever knowing what the halls of Cloud City on Bespin looked like and could only have gained that image from the Lightsaber. The other images that could have been from Psychometry do in fact hint that they were from Psychometry, due to her young age, but the first fact is clear evidence in my mind that she used it.
EDIT 2: Question title for original thread.