Lexi? Guilty? HAHAHAHAHAHAHAHAHAHA!!!!!!! ...wait, are you serious?
Orrrrrr, Lexi wouldn't pass up an opportunity to be in the spotlight, even for a little bit part— notice how she lingers even after the focus shifts away from her part.
Olive and Fletcher's plot in "angus' first movemANT" ends with Olive chasing Fletcher with a basket of venomous snakes. After the plot concludes, Fletcher isn't seen for the rest of the episode.