As soon as you charge after your dog, she thinks you are there to back her up. Otherwise, I think you dog would not have gone outside of your property to go after the wolf dog. What happened next could only be described as chaos.
If it is not this incident, there will be other event(s) that would trigger something between you and your mother. Find sometime when both of you are calm, (i.e., watch some tv comedy show or movie that you both enjoy), then try to talk it out.
Good point. Of all the triggering events he was bound to get one way or another, this was the best and least-destructive one.