AITA for not getting my sister food?

My sister and I both have money. She works full-time at Walmart and I work part-time at my college campus. I do my best to save up money for financial stability and to save up for a car. My sister will often times order food from DoorDash for our family, when and when I am not home. I try to but am price sensitive but it depends if we don’t really have much food at home then I would buy food. One day, I bought food for my two siblings and my aunt. I bought Mcdonalds, something slightly cheap in which I bought the $5 meals for us. My sister this day was not home and was working. It was around 5-6 pm when I had bought the food, we hadn’t really eaten all day so I thought I would get something. I have done this before and bought food for them while she was at work.

When I first did this, she did make a comment but we would always joke around about it and it was never really that serious. She would say something around the words like "wow whenever I’m not home you get something to eat." I never intended this to be in any way harmful to her the second time I did this because it was normal to get food obviously if you’re hungry. She came home at around 10pm, so 5 hours after we had gotten food. My other sister and I were playing games and it seemed okay when she came in because we asked her to join us once she settled down and put her things away. She was cordial and said yes and then brought up me buying food for the rest of us because my aunt had told her that I bought food. At first my other sister and I thought she was joking around but then things turned left when she started getting serious about it. She started saying that I could have bought her something but then I told her that it was 5 hours ago and it was just right then and there when we got it because we were hungry and it was something quick. She had this aggressive tone saying that she brings food for the family but she has never bought food for me when I am not home. Yes, when I AM home she does get food but when I am at school (I am usually at school early from ex: 10am – 8pm) and she buys food for them, she doesn’t get me anything and its understandable because they’re hungry and she has the money to get them food. Yes, I said something once but in a joking matter and not like how she was. I brought up a time when she did the exact same thing to me and she didn’t say anything back and went at our other (younger) sister because she made a comment and I backed my sister up and told her to not talk to her like that. I told her that she brought this to herself and started it first and that it shouldn’t have come to this at all, especially over food. So yes, if I have money, of course I am going to buy food for the rest of the family whenever I want to whether she is home or not. Just like she would do the same for them.

So, AITA for not buying my sister food?

Edit: Yes I feel bad for this but at the same time from my POV and thoughts I felt I was valid for this. I love my sister but it was honestly out of touch of her. I do feel bad for bringing up the event of her doing the same thing but I was just in the heat of the moment because I just couldn’t believe she would act this way about it. Please no hate towards her, it just might have not been a good day for her and it was probably the cherry on top that got her more upset. But at the same time she shouldn’t have brought those things to me about her doing these type of things when no one told her to and she willingly orders food for everyone.