Well to be blunt, no one has said that she's had NO training EVER. We still don't know who she is exactly, or who dropped Rey off to on Jakuu to begin with. For all we know she could have been one of Luke's new "younglings" in his new jedi school. Her training would have been minimal, but so was Luke's and look at what he accomplished. Yes she was just a small child, but so was Anekin...

Well to be blunt, no one has said that she's had NO training EVER. We still don't know who she is exactly, or who dropped Rey off to on Jakuu to begin with. For all we know she could have been one of Luke's new "younglings" in his new jedi school. If we subcribe to the theory that her memories were wiped, then she could have been unconsciously acting on instinct from her childhood training. It would have been minimal, but so was Luke's and look at what he accomplished. Yes she was just a small child, but so was Anekin...