She was taught by Luke for a third of the movie. That's how she learned to utilize her powers for good. She is the last Jedi because Yoda burned the sacred Jedi texts.
We don't need to use spoilers, I think people get what this thread is about at this point
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I don't think the title of the movie is referencing Rey is it? They were talking about Luke. Because Rey isn't a Jedi. Wasn't tearing down the Jedi religion a sub plot of the movie? Now there's just those with an affinity to the "light" or "dark" side of the force.