The grave was dug the moment she sent Minikagi to capture Grim. Now she's ready to in it. I'd say Impending Doom or Told You Not To Do That, though Told You Not To Do that is probably more the next strip than this one.
Done, thought I can't adapt her dialect into english (since I'm not a native, I can't do something complicated). Also, the first line might be clumsy. Someone feel free to correct it.