She only comments when a repost (in the same sub) contains one or more comments.
It is done to help users find more information about a post.
I see the idea, and I like it. But I'd put a list of duplicates into the post details element, or something like that. Sweet Pauline gives this a slightly moderated flair...
Out of the several duplicates/reposts, she currently only picks and comments in the oldest one that contains at least 1 comment.
As I said, it's a good idea. I'd even go further than you did, and put links to all duplicates with comments on the page.
I'm not sure about letting it be done by a bot though, but I can see upsides there. Maybe pauline becomes our collective robot waifu, which is promised to the one who slaughters the most of our enemies for his eternal afterlife.
(post is archived)