This sounds a lot like the problems my mom and brother used to have when they were living together. I don't know your mother, but I kind of doubt she makes plans just to spite you...it's more likely that it just doesn't occur to her to check with you. And in her mind, it's her car, and she has first dibs.
Since there are two cars, though, and she can take your grandma's car, it seems likely that there's something else going on besides just a conflict of plans. Have you asked her why she gets so upset? Does it have something to do with her attachment to the PT Cruiser? Does she resent you using the car for some reason? Do you return it in bad condition? Do you help take care of it, like paying for oil changes and stuff? Regardless of whether she's rational or not (and my mom rarely was when she picked fights with my brother) it is her car and if you want to keep living with her and using her stuff, you're going to have to take a deep breath, be the calm and rational one, and find out what's at the bottom of this, and work with her to find a solution.
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"If ten million people believe a foolish thing, it is still a foolish thing."
- Anatole France
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