I wonder why "death" isn't listed as a side effect, as well as a possible side effect. When taken correctly, it WILL cause death. It may possibly kill the mother as well.
The drug did exactly what it was supposed to do - detach the fetus from the uterine wall. What has not been disclosed (at least I could not find it) is how long since conception the drug was taken. If within a few weeks the fetus is relatively small and when it detaches the resulting bleeding is self-limiting.
I suspect that the date of conception was miscalculated and the fetus was larger than estimated. The resulting bleeding was no self-limiting and the poor kid did not seek medical attention for fear of discovery. Its not readily apparant from reading all this the lag time between dosing and when she was admitted for treatment.
Abstinence is so effective at preventing all this.