How did Mrs Gou Jian die?

Died of suicide.

She is a representative of ancient women in China, a knowledgeable, gentle and virtuous woman with a deep understanding of righteousness.

When Gou Jian was abolished, only she didn't abandon him. When Gou Jian was a slave in Wu, she was still standing beside him. When courtiers think Gou Jian has changed, only she still believes that he is our original king. She has done too much for Yue Guo. If Fan Li and Wen Zhong are heroes of Yue, then Yayu is the soul of Yue. I was humiliated for the King of Yue until the King of Yue succeeded to the throne. Finally, I committed suicide, which embodies the three obedience and four virtues of women in China. This shows that she is still a virtuous woman.