Let's hope it's just the 12 volt battery. Had something similar happen on my Oldsmobile Aurora. Gages all flickered and lost power. But the car continued to run at idle. After it was towed, it worked like nothing had happened.
I already commented to her that the cascade of error messages was likely do to a failing or low 12V battery. It will be interesting to hear the outcome of this. Just getting a cheap plug-in voltage meter for the acc. socket allows you to constantly monitor the battery and charging system. Well worth the $10 or so...