I remember that story well, IIRC she went to the USSR in the summer of '83; I was staying with my grandparents for the summer, which was also memorable for significant local flooding.
I saw her on The Tonight Show before and after her trip, and she seemed very natural and genuine, Johnny Carson seemed quite impressed with her. Tensions were very high at that time, because Reagan was talking tough and no one knew what the new Soviet leader meant. Pershing II medium-range nuke missiles were being deployed in Germany, despite a lot of big protests. In the fall it was The Day After on TV, and I kind of thought, well, this is probably what's going to happen.
It was very sad when she and her dad were killed. Everyone knew her as this sincere, smart smiling kid with a great future, and then, gone. Pilot error, missed the approach in the dark, tried to correct, got too low and hit trees.
BTW I remember asking my grandpa what he thought about the death of Yuri Andropov. "Well he dropped off, didn't he?" he said.