When Kisa Gotami's only son died, she was overcome with grief. She carried the dead child from house to house, asking her neighbours for medicine to cure him. The neighbours thought she had lost her senses, as the boy was already dead and no medicine could help him. Finally, a man directed her to the Buddha, who she believed could give her the medicine to revive her son.
Source: The Story of Kisa Gotami, Chapter 8
The question is worth 3 marks, so cover three key points: (1) her grief-stricken state, (2) the action she took — carrying the dead child and asking for medicine, and (3) the neighbours' reaction and the man who directed her to the Buddha. Avoid going into what happened after she met the Buddha, as the question asks only about what she did immediately after her son's death.