She walked in to a crowded food distribution center for refugees:
Pakistani Prime Minister Yusuf Raza Gilani said those responsible had no regard for humanity or religion, and that the fight against militants would continue.
Pakistan's Taliban said they ordered the attack on the distribution centre, which is used by the World Food Programme and other aid agencies.
They said the rebels had targeted the local people - displaced members of the Salarzai tribe - because of their support for the Pakistani military.
An estimated 300 people were queuing for food at the time of the blast, with reports saying at least 100 people were injured in the bombing.
The tribal district of Bajaur, where the attack took place, has seen several military operations to clear it of insurgents.
The army had previously declared the operations a success and the area safe for the displaced to return to.
The attack also came as Pakistan's military took action against militants in Mohmand, an adjacent tribal region, killing an estimated 40 rebels.
Pakistan is paying the price for playing both ends against the middle with regards to terrorism and the Taliban. The Northwest Frontier Provinces are not controlled in any real sense by the Pakistani government and every effort they make to clear the region of rebels, militants, and terrorists is met with a countermove by the enemy.
There has been talk of US special forces taking a hand in this battle but Pakistan is resisting. A few more attacks like this one and they may have to reluctantly change their minds.