Another thing to consider, don't get all worked up about this, it is what it is, let her react how she wants to react, agree with her, use the guideline I've provided and the argument will be over sooner and easier than if you had defended yourself against her.
These situations are going to happen... OFTEN ;-)
You know that now, I told you this already, that is your advantage, since you know it's coming, it's not a surprise, it's not unexpected, you can control yourself, show some emotional strength by not getting excited or angry or argumentative and just handle it like a strong man can.
