Board Thread:Spoilers/@comment-3125844-20150109204749/@comment-24397663-20150115090839

huh... she's frowning, all right, but to me it looks more like she's thinking about who/what might've done that. It's a little like Nick's expression on the sight of a crime scene.

If she truly had something to do with that (i.e. was activly involved in the explosion), she would be looking more shocked or satisfied, depending on wether she did it on purpose or by accident.