Rey couldn't seen Luke's hiding on her own. Mainly because relatives left her on Jakku, when she was young and she couldn't remember a thing. I can't imagine that Ben corrupted before he got 16, Rey would be 8 years old by that time, more than enough to fully remember things, including face of her father and planet she was raised at.
I think, that in the moment Rey touched original Skywalker's lightsaber, she got "connected" not only to the Force, but to Skywalker himself, catching a vision of a place he hides.
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Spoiler