It was twins at least, but judging from the gestational age, most likely triplets, that allowed the birth of one of the babies. The second one was stuck in the birth canal, and the sac still intact. The baby in the toilet had the full placenta still attached. The most likely explanation for the mom dying was from blood loss internally because the placental attachment in the uterus would have bled copiously. There could have been a placental abruption, or an amniotic fluid embolism as well. It is also possible she was suffering from eclampsia, which is common in multiple pregnancies, and causes stroke and death in pregnant women.
PunkNana66 Thanks for sharing your info. Always nice to come across info on deaths in these vids that aren't immediately explainable. Saves some of us the research time, lol