If she had hit the median head on at 55mph the bags would have blown. But just a glancing blow on the corner like that? Nope. Probably would have done more harm than good to go off. Heck, the driver side headlight is only cracked a bit.
Corner hits almost never blow the bags as it isn't a collision typically going to bring you to a sudden forward stop. That is almost the only time the forward bags should go off is a direct (or near direct) front end hit beyond a certain force that would be above the safety point of the seatbelt.
I get the impression some people want the bags to go off if someone love taps the bumper
She should actually be happy they didn't go off, otherwise the repair bills would be so much higher (or the truck possibly even totaled, that looks to be a relatively simple repair job).