When Slobodan Milošević ordered his troops into Kosovo as part of the Kosovo War, Becker led a humanitarian aid convoy to the region. When the borders were closed, she brought the convoys to northern Albania where thousands of refugees had escaped from the fighting. Led by a soldier from the Kosovo Liberation Army, she crossed the mountains into Kosovo on foot to bring pediatric medicines to a besieged hospital in Junik. She was asked to take 25 injured children and their mothers across the mountains to safety. They were ambushed by Serb paramilitaries and Becker, who stayed behind to help a woman and two children who were trapped, was captured and imprisoned. The families made it across the border and, when Becker was eventually released, she traced them to a refugee camp in northern Albania.