We don't really need a sequence for Leia to explain "Yes Luke trained me for a few years after the Battle of Endor, but then he fucked off to explore the galaxy for Jedi artifacts and I didn't go with him because I wanted to stay with Han and focus on my career in the New Republic."
We the audience when viewing the series can pretty easily draw the line of "Okay we find out she's force sensitive in ESB, we know her and Luke are close, Luke is a Jedi and wants to train other force sensitives, and between RotJ and TFA 30 years have passed"
Luke trained her , yet when Kylo comes out . She is like don't look at me.
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Bender: Well, everybody, I just saved a turtle. What have you done with your lives?