I think... I think she was gonna try and claim the same role but as a scavenger thing. And I think there's a way out... Ms. Carter is out of poisonings, you know. So... if nobody is poisoned in the morning... and she says "Oh, I stopped anyone from gettin' poisoned..."

Hell, she might even throw Ms. Carter under the bus in the process - say she figured out she's the viper. That would add a lot of credibility to her claim.