Mixed feelings about this story, on several levels. On one level, it was very effective - disturbing, chilling and well-told and narrated. On another level, it put me in the mind of someone I really didn't want to spend any mind time with. This was not a narrator that was even remotely appealing. On a third level, it achieved a lot - the first ten minutes were *very* effective and making me understand this woman's madness, and how (and why) she could kill her children yet love them. But I found the ambiguity of the second half of the story - was there really a wintergod? Was she just becoming more unhinged and hallucinating, or was anything she described real? If it's the latter, then the supernatural horror somewhat dilutes (and justifies!) her actions in the first half. And if it's the former (as I think is far more likely), then it also dilutes the first half - the story of someone sort-of-rational killing her children is far more horrifying than the story of someone totally off the deep end having bad hallucinations and feeling violated by her medication.
So, yeah, a good story, and one that I'm glad PP choose to play - but not entirely succesful in my eyes.