Maybe wait until you meet her face-to-face, @Miz0. Was she jetlagged? Is she appalled at her awful mistake? Will she pay for the damage?
If not, and if you get the sense after meeting her that it will be a nightmare stay, you might give Airbnb a call and explain. They may be able to find her someplace more foolproof? If that is the case, it will all be handled without penalty.
Honestly, though, you do not imagine, before hosting, that you will have to put a note on a plastic kettle that says "This is electric! See the cord? Do not put it on the stove!"