Crazy sister

Hello, so I’m a recent college graduate. I live with my sister and her boyfriend in a two bedroom apartment. I’ve on and off struggled with getting to work on time. I’m on a current written warning from my employer but my sister doesn’t know that. She has bipolar, doesn’t need to know, I don’t give her extra info or ammo she doesn’t need to know. She asked last night when I had to be to work. I said 9 but it was 9:30 because my boss told me to adjust my time. I wanted to leave early to

Get Starbucks and food before hand but I liked my bed more this morning and it didn’t happen. I ended up leaving at 8:55 and my sister calls me and is like when do you have to punch in? She’s like I thought it was 9 and I was like yeah I wanted to

Come in early to get stuff done. And she’s like the next time you tell me the wrong time you owe me money. She charges me money because I have issues with add and not remembering things. Who is crazy here? Why does she care? It doesn’t affect her! Right?