I wish I could work out what triggers it or if there is anyhting that I am not aware of that I do inadvertently that provokes it but I am not sure it works like that... .
There has been a lot of stress with work. There has been a string of external things but I think it does not and will not make sense. So I will stop trying to make sense of it.
There may be something you do or say that triggers something for her, but most likely not. I think you're more accurate in saying that it doesn't make sense. Stress may be the common denominator though. I found that if I can get my fiance to express that he's stressed, he is less likely to rage, but if I don't recognize that he's out of sorts, all hell breaks loose! We aren't expected to be mind readers, but I have gotten to know the look that he gets when he's stressed and I'll ask him about it and he'll now open up a bit when he's stressed and tell me about it.
Glad that you could see the sunny spot in the darkness of her rage~~bravo!