How does the author use foreshadowing in The Flowers?

There is one point of foreshadowing in this story: when she stops, arms full of flowers, and looks at her surroundings before heading back home. The place is gloomy, damp, and silent. Prior to this, everything was bright and beautiful. The reader is put on alert with this foreshadowing, knowing something more sinister is about to take place. It is on her way home that she steps into a dead man's face.