She was not even given any painkillers. They basically tore her womb, a most sensible zone if you are in labour pains. To be beated is nothing compared to that... More than that the baby is still attached with the mother via the cord. And the death is not immediate for the mother, so she experienced everything full force.
Not to mention that at that time she was innocent so she most likely became really attached to the baby in pregnancy. And she scarred herself for the man who ordered her to be tore apart and her life was made a hell by the concubine and sister beforehand. Disgraced, humilliated and nobody by her side, not even her mother.
Theit punishments are very very well-deserved.
Sometimes I think that the punishments are too harsh but then I remember that they forcibly took her baby out of her womb