"All was ended for her." What does that statement from The Necklace mean? Is there more than one possible meaning?

The literal meaning is as you have suggested. The party is over, and the wonderful night Madame Loisel has had with the wealthy is also over. This also foreshadows the scene that follows, however. Madame Loisel discovers the necklace isn't around her neck, and this means her life as she has known it up to now is also over. Her hopes and dreams of joining the wealthy elite are dashed since she and her husband will now have to work for ten years to pay for the lost necklace. By the end, Madame Loisel looks older than she should and has had a much more difficult life than she would have had if she had been honest.