If she posts a pic with North she's exposing her daughter, when she doesn't post a pic with her you still complain. Maybe Nori was looking rough and Kim didn't wanna do her daughter like that.
Now that I think of it, maybe it was just for publicity. Kim is a fame ***** (a ***** period), so it wouldn't surprise me if she just did this for the kiis/publicity. She was probably sitting back laughing her ass off reading the comments on IG, loving the attention that cropped photo got .