It sounds ahead of its time on even talking about such issues. If love to read it.. I've never heard of it. It wouldn't have named it as post partum depression, right? Women suffered terribly from physicians misdiagnosing them or not listening to them or recognising what we now know to be legitimate mental health issues, often related to hormonal health.
Yes you're right, it didn't name it in the book as the woman experiencing post partum depression. It just hints at these new feelings/emotions begining shortly after she gives birth to her child.
Ahead of its time or maybe we are still just so very slow to progress in some key aspects of life?