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Was she supposed to?

in the original story, (Karen) did not forgive (Lloyd) and was on her way to Reno,
Did she meet the Countess de Lave?

I wouldn't be at all surprised if Addison told all at the party after the awards ceremony.
I would. Addison, for all of his admiration for Margo, Lloyd, and Bill as artists, has no respect for them as people. He certainly doesn't see them as his equals, and would have no reason to confide in them, not even to brag.

I wouldn't be at all surprised if Addison told all at the party after the awards ceremony.
After all, he had no reason to keep it back, and they all could have enjoyed a good laugh at the news.

Birdie spotted her right from the get go with her comment about " everything but the blood hounds snapping at her rear end."
You may as well go to perdition in ermine; you're sure to come back in rags. Katharine Hepburn

I don't think the others knew about Addison and Eve's confrontation.
I think that's right. Addison would have no reason to reveal to the others what he'd learned about her, and Eve certainly wasn't going to. And in the meantime, Margo, Bill, Karen and Lloyd had all come to their own conclusions, one way or another, about Eve's duplicitous nature.
And of course, sharp-eyed Birdie, who disappears in the film's second half, began to spot Eve for what she was long before any of the others did.
Poe! You areavenged!