Things to talk about??

Idk where else to post this..

So I live with 4 other people. One of which is my nana. She's very....eh I don't really know how to describe her so here goes

She complained to my stepmom saying I must hate her because I don't talk to her that much, when I'm not a talkative person to begin with. Which she doesn't understand or care to. Then she was also mad that I asked for my stepmom to get diapers whole they were out because she asked if I needed anything and it was easier than doing a short trip because my son doesn't like to get out of a car for 1 min just to get back in. The reason she's mad about it is because the other day I ordered food to the house even though I didn't pay for it, another concept she just does not understand. So she basically thinks that wasting money on myself ordering out even though I wasn't, because again: I did not pay for it. She doesn't understand that I didn't actually spend any money that was mine and I'm just beyond frustrated with living here at this point because everything ends up being something for her to complain about. For example: she'll tell you to get something and she'll pay for it and then proceed to claim that you're wasting her money. Or if she has an issue with you she won't talk to you about it, she'll talk to another family member in the house about you.

I'm just trying to keep the peace so what tf do I talk to a 50+ woman about that's super closed minded about pretty much everything? Cause trust me if I could afford to move right now I would.