The speaker keeps saying her mother *was* something, and each time it's a place: a canyon, a train line, an airport sidewalk, a rainy street, a gilded angel, a crumbling house. The title, "Everywhere," gives the idea away. The mother seems to be gone, and the speaker finds her scattered across the world instead of in one spot. The verb "became" in the fourth stanza hints at that change.
The feeling is grief, but it's quiet and not dramatic. The images are solid and a little lonely, like the single pigeon, the angel watching from above, and the speaker hauling a suitcase with a broken wheel. Yet there's comfort too. Nature and travel carry the mother's presence, and the ending turns to family roots. The jackdaws in a Polish village keep calling their old name, "Kawka!", and they never change. The mood is wistful and tender, a loss that settles into something lasting.