How do I deal with my narcissistic mother while living with her?

My Narcissistic mother had an inappropriate response to a request this morning. My stepdad asked her to drive her car to work this morning, instead of my sister’s car; which she had been driving for a while now. This would mean moving a couple cars from behind her car in orded for her to drive her own car. Even so, she went on a shouting spree, talking about why she was not asked to do it the day before, and askinv what’s wrong with everyone else’s car. She has to be at work at 7:30 am. Her job is 5 minutes away. She was asked this at 6:50 am, and made a big splash about making her late for work for having her drive her own car. She said it was inconvenient because it had not been driven in days. She complained about how it would take time to put her new tag sticker on it. The thing is, she had the tag sticker sitting around for a couple weeks now. So she did some more yelling, grabbed my sister’s car keys, and drove off with my sister’s car anyway. Had anyone of you had a Narcissistic parent act this bad?