I added https://blog.jessfraz.com/index.xml as a feed a few days ago, and noticed it didn’t show as having a new item recently, after she mentioned a new post on twitter. The stats page shows 200s all around, but no items in the feed at all. w3c’s feed validator barfs on an SSL connect error, but pasting the contents in returns a valid feed.
FWIW, stats shows 14 other people subscribed to this feed.