Hidden Symbolism?

As the story progresses you can see that Mrs. Pontellier and Madame Ratignolle are becoming rather close. Good example is the scene in chapter seven where they both share some deep ideas with each other. However there is a little bit of symbolism/ possible foreshadowing in that same scene as well. As stated in the scene there are two lovers are cuddled under a children's tent that the two women can see from their view from the porch. Also, there is another woman in black seated near them as well. Now why would Chopin mentions specifically that the woman is wearing black? Black is usually not a good sign, usually a color associated with death, and other heinous dark things. So what I could build from this scene is that two young lovers are in the same picture as the lady in black. Can this possibly foreshadow a negative outcome of a relationship further in the novel?