The pressure from society and patriarchy on women to procreate.

spider symbolizes offspring, who might later become the victims of the dark side of humanity

grandfather clock symbolizes the family legacy that needs an heir to inherit

tall woman symbolizes the family bloodline that needs to be passed on

Surprisingly, the seemingly open-minded husband was behind this whole thing and orchestrated the wife to participate this trial to fix her "problems". While clearly there's nothing wrong with her, she is perfectly normal to not want to have a baby.

While the seemingly harsh father later changed his mind and just wanted his daughter to be happy.