Before Karen's trick, there was a considerable build-up of Margo's bad behavior, and repetitions of seeing others frustrated with her. Almost nobody saw any cause for it, other than Margo's ego and issues. Only Birdie saw through Eve.
I think Karen's wanting to do something to give Margo her comeuppance is accounted for in the script.
The fact that Karen chose such a big punishment, with considerable risk for long-term repercussions, seems out of character at first. But I actually like that -- I can see how it could happen.
Karen is a straightforward, generally kind person, not interested in being a mover and shaker, or showing off - she has none of the competitive urge shared by virtually everyone else in the film.
Most of the other characters are either hyper-alert to the possibility of backstabbing from others, or backstabbers themselves. The backstabbers could (and some of the them do) come up with lots of sly, subtle ways to trip someone up, biding their time, building up in increments. They know how to do it.
But when Karen, who has never practiced being a trickster, tries it, she clumsily goes for something big, and makes a mess.
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