What events led to the tragedy on the night of March 13, 1981 in the book, Midwives: A Novel?

Several things contributed to the tragedy that occurred on the night of March 13, 1981. As always, the baby was Sibyl's priority; therefore, she decided to save the life of the unborn child after viewing convincing evidence that the mother had died. Later, Sibyl will be called a murderer for performing a cesarean section on the young mother.