Concerned she's delusional

Example: Had trouble starting my car before going shopping. She had told me to call if it wouldn't start after shopping and she would come get me. She needed to be at work and I was to babysit. It wouldn't start, but couldn't see the point in calling her, that wouldn't fix my car. Called the tire store, had them come give me a jump start, went to the tire store and paid for that service, then ran home to pick up the kid so I could go back and get a new battery put in. Tire store said they would credit me for paying for the jump start when I bought the new battery. Done.

Later, when she gets home, we had a conversation about it:

Me: Thought of calling you when my car wouldn't start, but that didn't make any sense, because you wouldn't be able to fix my car, so I called the tire store and had them come give me a jump. They wanted me to go pay for it right away so I had to do that before coming to pick up little one. That's why I couldn't turn the car off. I had to go right back and get a new battery, and they gave me credit for what I had already paid.

Her: They gave you credit for the tow truck?

Me: What tow truck?

Her: The one that towed you back.

Me: I didn't get towed, they gave me a jump start.

Her: Oh, and now you have to go back and get a battery?

Me: No, I already got a battery after I picked up little one.

Her: So now you have to install it?

Me: No, they installed it there.

Her: And they're going to pay you back?

Me: They already gave me credit when I paid for the battery.

Her: But are they going to pay you back for the battery?

Me: Who?

Her: The insurance company from the accident.

Me: That was 2 months ago and the lady just backed into my driver's side door. It had nothing to do with a cell going out in the battery.

Her: Oh, I thought it did. They should pay you back.

I'm at a loss for words. Is she delusional (not being sarcastic). I'm really concerned about her thought process. This is only one example of many, many. Is there anything I can do or suggest??

I don't know if this is delusional behavior. Maybe she was distracted the previous time(s) you talked about your car issues, and therefore she doesn't remember the details.

Now, if next week, out of the blue, she asks you, "why didn't you call me last week when the car didn't start?" with follow-up questions for more details, then she could be trying to get you to recount the events to see if "your story has changed". If she determines that "your story has changed", maybe just because you've added new details or omitted details, and she suggests that the discrepancies in "your story" are proof that you're lying, then she might have DD.

Thank you for relieving my worries on that regard. This was all one conversation with her though. There were no previous times. It was literally a back and forth conversation with her looking me in the eyes. She is my granddaughter and we've had many problems like this since she was little. Like make your bed, I did, then why isn't it made, I don't know what happened to it but I made it so stop picking on me, etc. Now that she's an adult with the problem still there, I was looking to see if it was something that could be improved upon, but maybe I just need to accept that her way of thinking and seeing the world is just different from mine.