Is diya or kaffara obligatory for a pregnant woman who delayed going to the hospital after the onset of labor pains in her ninth month, which led to the death of the fetus by strangulation, according to the doctors, especially since she was previously aware of labor pains from her four previous deliveries?

There is no sin, blood money, or expiation upon the woman in the mentioned circumstances because the default is the acquittal of responsibility. Not going to the doctor immediately after the onset of labor pains or refusing a cesarean section after the doctor has stated its necessity is not considered negligence or a cause of death.