Did the ancient Greeks and Romans actually worship Eris and Discordia or was she just a mythological figure?
Were there cults of shrines related to her, or rituals related to her or keeping her influence away? If she was worshiped, how so?
It's very hard to meet the requirements for a top level comment with this one, because the answer simply is:
No, they didn't.
Actually I wouldn't even go so far and call her a mythological figure as she is merely a (literary) personification.