How did Zhuge Zhaosu die?

Didn't introduce how she died, only confessed Kuaiqi's family was killed by Mengda. Supposedly, Sister Zhuge Liang wouldn't dare to do this if she was still alive at this time, giving Mengda ten courage to prove from the side that Sister Zhuge Liang should have died long ago. Then the cause of death is probably disease. After all, in the three countries where medical conditions are not very developed, people's life expectancy can not be guaranteed, and any minor illness that seems to be fatal now.