I am so very, very sorry about your sister's death.
I wish I had solid answers for you, mothers do die of preeclampsia/eclampsia/HELLP today, even in the US, even when they have no risk factors like PCOS or obesity. We don't know exactly how many, but it is too many. Preeclampsia is sometimes slow-moving - the average time from diagnosis to delivery is two weeks, but that average encompasses women who stay relatively stable for weeks or months, and women on the other end of the spectrum who are delivered right away at term - or who get deathly sick in hours. We've had women on our boards who were "fine" at a noon appointment and in full organ failure at 2am that night. We've had women who didn't seem very sick until after they had their babies, and then died postpartum. I am so very sorry that your sister got sick so quickly and died so tragically.
Please let us know any other questions you have, or ask us to keep explaining. Wrapping our minds around this disease is hard in the best of circumstances.
