Please Read!!! Family issues

Okay this is a very long story I would appreciate if you could read it all and give me any advice on what I should do!

So if you saw my other post recently you would know that my older sister recently moved back home. Since she moved back there has been a lot of tension between us and 4 days ago we got into a huge fight.

A little backstory before we get into the fight. Basically since my sister has moved back she has been making all these demands that I have dinner cooked before she gets home from work, that I do her laundry, and that I should also have the house always cleaned because in her words “ she works and studies so it shouldn’t be a problem for me.”While I understood she worked I have been very busy studying for my upcoming GED exams while also taking care of a house and pets all on my own. - the reason I take care of the house is because my dad is a truck driver and is usually gone for 3 to 4 weeks at a time and is usually only back for 3 days

On Thursday she had her boyfriend come to the house to cook for her because I wasn’t cooking earlier enough for her, I let it go and ate dinner. we had planned to go to HomeGoods that night and shortly before we were planning to leave she made a comment saying how all the clothes in the laundry room she was going to be moving to the garage, at this point I had enough of her demands and told her she would not be moving anything to the garage and that the laundry would get done when it gets done. She started getting loud and stated that the laundry room had been like that for months and because I didn’t have a job I should’ve been able to do laundry, I told her I had been studying and then she went on to say I use me studying against her as well as said that I wouldn’t have to study if I would’ve stayed in school.

Side note : the reason I’m getting my ged is a very long story but she knows why so for her to use that against me was hurtful but not uncommon for her as she always uses low blows against everyone that argues with her.

I’ll be honest I feel like my sister is a very selfish person who uses everyone around her for her own benefit.

Since are fight there has been so much tension between us that we can’t even stand to be in same place anymore. I desperately want her to move out but unfortunately she can’t do to everything being expensive.

She also keeps telling my dad that she just wants to kill her self. she has said this multiple times in the past and before I would always feel bad but now I don’t I feel she uses that as a manipulative tactic but what do you guys think?