Deb Heine asks the question that occurred to me -- is this the same strangely-behaving woman with a backpack some concert-goers alerted security about, only to be told "Shut Up, Racist"?
If so, obviously she didn't detonate her bomb. Lost nerve, maybe it failed.
Still, I'd be mighty curious to see if the woman who reported seeing a girl acting "figity" with her backpack recognizes this woman.