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That jacket is obviously not a bomb. However, we've lived with the increased airport security for 6 years now... you can't even take a nail clipper with you on a plane... they routinely search cars going into parking areas, and they even put up signs saying they are in elevated security status. I'd think someone as bright as she is might figure out that what she was wearing might cause some alarm. Especially considering the Adult Swim advertising scare that hit that place earlier.
That said, I hope that the legal mess she's in goes well for her. It's pretty obvious that she didn't go in there trying to scare anyone or with any sort of pre-meditation. She never threatened anyone either.