lovezebs - I know it!
I can't believe I didn't think of it sooner!
I've definitely had a few creatures who were not deterred by the bitter apple spray. (Which is a very useful item. It's even safe for use on bandages if you've got someone who's picking at a bandage. You've just gotta spray it in a well ventilated area and hold your breath, as you'll get a taste of the awfulness if you inhale it while airborne)
But I haven't seen her chewing lately so I think it's working nicely.