How does Chopin use natural imagery to help the reader understand Edna's mood

Examples of imagery:

The conditions of her life were in no way changed, but her whole existence was dulled, like a faded garment which seems to be no longer worth wearing.

But there was no recent picture, none which suggested the Robert who had gone away five days ago, leaving a void and wilderness behind him.

Edna plunged and swam about with an abandon that thrilled and invigorated her.