Gwen/Cav
Clearly she is not dealing with it, so other steps will need to be taken. I hope you're up to the task.
Let me make one thing very clear: I am not a crisis manager or a professional cleaner; I am not here to mop up your and Ellie's public messes, but in part to prevent them from being made public in the first place, and as such this situation already falls under my purview. Furthermore, I work with you, not for you. I have autonomy to do as I see fit for the good of the team, and I will use it. If that bothers you, make a formal complaint to Mr. Urquhart.