That woman was Butcher Zhang's current wife, and Zhang Xiuxiu's adoptive mother in name.
The reason she had wanted to commit suicide was that she had suffered a miscarriage which left her infertile. Her ruthless husband had divorced her, and feeling utterly hopeless about the world, she decided to jump from a building to end her life.
Butcher Zhang had talked her down and even offered her a job—caring for a baby girl.
Chapter 344