It will help you remember that psychology is only one belief system by which we can measure ourselves. Of course, don't insert Freud's lesser-known wisdom in the midst of an argument. It may only feed her fire. Quote it to yourself. It will guide you in understanding that your girlfriend is probably using psychology to hide her fear of intimacy.
Relationships are alchemical vessels of transformation.
When the heat is turned up, through passion or disagreement, all of our deepest fears bubble up and out into the open. Your girlfriend probably experiences your silence as an exit rather than as the self-care mechanism that it is for you. If she continues, tell her that you need a timeout. Then leave the room for a short time. It allows you to unplug from the charged environment.