Why didn't Guanyin Bodhisattva save the Tang Priest's biological mother?

Although Guanyin Bodhisattva is merciful, she can save the suffering and help all sentient beings, but all sentient beings suffer, and everyone has some sufferings. Some people can get by, others can't.

Just like Tang's mother, who was originally a rich girl, she found the No.1 scholar at that time, that is, Tang's father, but because she was harmed by traitors, Tang's father can be said to be very pitiful.

Just a top student in high school, married a beautiful wife, should have stepped onto the peak of life, but it happened that fate reversed and everything became someone else's.

However, since Guanyin Bodhisattva helped the poor, why didn't she save Tang Priest's father? Because we can't, it may be the fate of Tang priest's father, or it may be a simple blow to terror.

It's just that after all, cause and effect, so many people, so much suffering, Guanyin Bodhisattva can't save, Guanyin Bodhisattva can only save those people whose fate should not be like this.

But in fact, if you think about it carefully, if Guanyin Bodhisattva saves Tang Yan's mother, her mother will face a father she doesn't love or like every day, and even this man will kill his own child.

Isn't this more painful than death? Bodhisattva crosses people, but people must first have their own meaning to live, and bodhisattva can save them, otherwise, they can't save them!