OK, I did miss that you mention at the end that she'd become the team's leading scorer, but that kind of belittles the magnitude of the change. You gave such a detailed breakdown of the rest of her stats, it's weird that an obvious one (and one that is, frankly, a lot more relevant than her steal rate) like scoring rate would get left out. She went from scoring 18.4 per 40 as the team's six scoring option (and playing in a lot of garbage time) to scoring 22 per 40 as the main focus of the defense. That's roughly the same gap as the one between Breanna Stewart and Gabby Williams who, no disrespect to Gabby, wouldn't be scoring nearly as efficiently if she were the first focus of the defense. To do that, let alone that she did it while going from shooting 45.8%/38.9% to shooting 52.5%/48.1%, is impressive, and reflects far more than better shooting ability.
I didn't pay enough attention to Liston in her freshman season to have a sense of her improvement on the defensive end, but I think those numbers make a very compelling case that she became a much better offensive player.