Forgive the simplicity, but isn't it possible that the juror just felt that other photos were better in his eyes than the landscapes this year? I really like all your photos.. they're of high quality, but it's ultimately up to him. Someone has to make the call. The simple fact that it's a landscape among other genres doesn't qualify it for selection. It sounds like that's just how it ended up this year, not a usual practice for this exhibition as evident by her surprise.
I would be upset if I had a submission that was omitted just because the juror felt he had to make room for another genre, despite his opinion about the quality of my photo. By its nature, this sort of show is subjective.
Just another side to the coin, no offense meant!