I read the article on this topic today, in the NY Times.
NPR has also been doing an occasional series on the number of women who die shortly after giving birth in the United States. One new mother they focused on was a NICU nurse. Another worked for the CDC.
When the statistics are presented to you, and you hear the women's stories, it is very sobering. Something is seriously wrong with post-partum care in this country. These are preventable deaths.
Both patients and healthcare providers need better education. Ms. Williams was fortunate in that she is familiar with the signs and symptoms of PE. She wasn't going to be denied proper medical care, and could advocate for herself. Not everybody can do that, even when they are highly trained nurses.