This establishes that, yes, Jean *did* intend to kill Sue.
It doesn't explain *why* she went homicidal, though. Meltzer's "Womens is crazy!" explanation is my prime complaint regarding IC. And no one has attempted a more nuanced explanation.
My other IC complaints: How Wally and Kyle were treated by the other characters. The JLA acted like Wally had become the Flash just last week. Kyle was someone the JLA were stuck with due to their bad luck he got a power ring.