AITA for wanting my sister to do more chores around the house?

​I (F24) live with my mom (59) and sister (28). Dividing chores has always been a struggle. I do my part, but my sister constantly complains and accuses me of doing nothing.

​Context: Chores were always treated as punishment in our house. My mom used to say that if I didn’t study, I’d end up as a housewife "stuck cleaning" like her. I’ve always felt more pressured to clean than my sister.

​Last year, my mom had a health scare. While she was hospitalized, my sister stayed with her. I stayed home and deep-cleaned the entire house for my mom’s return. The next day, my sister cooked lunch. I did the laundry and then sat down to study (I’m currently unemployed, studying for service exam).

​My sister demanded I wash the dishes she used. She is extremely messy, using multiple pots for one meal. I said no, as I’d already cleaned the house and handled the laundry. She blew up, claiming she was "exhausted" and that since I spent a few months away recently, I "owed it" to her. She harassed me until I cried in front of guests. My mom saw it all but didn’t intervene.

​Now, whenever we argue, my sister says: "You’re home more/unemployed, so you should do everything." If I talk to my mom, she dismisses me, saying "others have bigger problems" or "people are starving."
​My sister also mocks me for attention. For example, the first time she met my boyfriend, she told him he’d "have to get used to unblocking sh*t" if he lived with me. When I got visibly upset and went quiet, my mom – who was right there – called me "annoying" instead of calling out my sister. She often tries to make me look "silly" in front of others. When I confront her, she calls me a hypocrite and claims I humiliate her, though I usually just avoid her.

They both tell me I "make things up," even when I remember them vividly. Coincidentally, they only think I "invent" the things they did wrong to me (they even claimed I was lying to my therapist about my mother). They’ve told me I don’t need therapy because I "don’t have problems.

Generally, we get along, but we have this "silly" problem that I can’t seem to solve. I have insomnia, so I sleep late and wake up late, which drives my mom crazy. I’m trying to wake up earlier, but with the exhaustion and anxiety, I’ve been feeling increasingly unmotivated. I still study and send out resumes, but it never feels like enough.

​AITA for wanting my sister to help more? Am I a bad daughter? Please be kind and give me tips on how I can improve this situation.