Yeah I disagree with the suggestion that she should focus on 400. Her split just shows the massive potential she has in the 800.
I could see her qualifying for World Championships, but perhaps not doing great there, as NCAA is a long season. But next year, I could see her lopping at least 2 seconds from her PR, and is one of the few I see with the potential of an American Record. Too many American 800 runners are 800/1500 specialists, and 1:56 or faster is just not a possibility for them.