Accuray How's her sense of humor. For me I've found accepting and escalating to work. In other words:
"did you leave the lights on again"
"yes, I'm doing an experiment on light consumption"
The key is to use a light humorous tone.
It diffuses the situation, makes her laugh, then hopefully makes her feel silly for losing her temper. Clearly it doesn't always work, but try you'd be surprised how often it works.
