On 13 June 1942 Drvar was retaken by the Partisans, with Bursać's labour company clearing rubble and repairing houses in the town. The company also helped in working the land of families whose men were away fighting with the Partisans. In July, Partisan units composed of fighters from Serbia and Montenegro came to Drvar, and Bursać helped carry their wounded to field hospitals in the mountains. She was one of the most active members of Kamenica's SKOJ organisation, which sometimes met at her house. The Partisan-held territory around Drvar expanded significantly, and included the Sanica River valley in late July 1942. The valley's primarily non-Serb population had fled before the advancing Partisans, whom they feared because of Ustaše propaganda. The Partisan command engaged young people from western Bosanska Krajina to harvest wheat and other crops from the valley, transporting them to storage facilities on Mount Grmeč. The workers (mostly young women) were organised into military-style units, which were merged in mid-August into the four-battalion 1st Krajina Agricultural Shock Brigade. Bursać was appointed political commissar of the 3rd Company of the brigade's 2nd Battalion. Guarded by Partisan units, the brigade completed its work despite attacks by enemy planes. Bursać was admitted to the KPJ at the end of summer 1942; at the beginning of 1943, she was president of the village committee of the United Federation of Anti-Fascist Youth of Yugoslavia (, or USAOJ).