I'm not surprised. She's not stopping her coverage for anything besides a terrorist attack. She didn't give Leila Fowler's case any attention when the Arias trial was going on.
ETA: Plus, the Zimmerman trial is every weekday, and NG show doesn't air new episodes on weekends. NG can't just stop reporting on the trial for a few days, and then go back to it. Plus, there's always so much to discuss that it easily fills up the entire program.
Not to defend someone that I personally do not respect, but I do think that NG does not have any choice, and it is her network that dictates the non-stop coverage of the big trials, the whole evening lineup is about the trial.
And, on a more related topic...
I have seen LE claim it is an isolated incident and there's no need to fear before, even when it turned out to be a predator situation. I think as long as LE thinks there is no other linked case, they call it isolated. And it is an isolated case, until it is not. :scared::twocents:
Eta: my personal theory is that it is someone in the neighborhood, and that Alanna unfortunately chose the wrong doorway to go through....