My sister has gone rogue

My cousin (19F) and I(24F) wanted to go the new mall. But since, my older sister (26F) was not here and made fuss about us going without her somewhere else previously, we waited for her return. When she returned, I told her we will go to mall on weekend since im working monday to friday and i dont have time. Weekend came and I told her we will go at 4pm. When the time came she started her drama that she doesn't want to go she is not in the mood. She is known for cancelling plan last moment or cancelling it altogether so we were not surprised. My cousin and I insisted twice and then started getting ready as we had no hope. Eventually she got ready and came with us.

When we reached the mall, i wanted to explore all the clothing shops but my older sister kept insisting that she is hungry and we should eat first. After her constant yapping we went to the food court to feed her first. I didn't know any outlet there so i was checking out where we could eat. But she kept constantly nagging in irritation that why are we not sitting to eat. I kind of lost cool and said in slightly higher tone that can she stop for a second. i am figuring out. stop acting like a kid. i know I should've kept a lower tone but oh well. She yelled at me in anger and went away. I said don't be angry please come back but she was very mad. We tried to persuade her but all in vain. Eventually, she called a cab and went home. we couldn't do much so we stayed in the mall.

It has been a week since then and she has not stopped being a B. i have avoided her in all circumstances and didn't talk to her since then as whenever i did in past, she made whole scene in the house. So I completely ignored her to avoid drama.

Today I wanted to use the table since my back started paining (i work 10hour shift WFH). I asked her for the table and she caused a whole scene that its hers and she will not give (the table is not hers, mum got it for everyone's use). She is unemployed and literally plays game all day in that table. Now she has closed the door of the room and isn't letting me in (my clothes and all stuff is in same room).

I dont how to deal with this. She fought with mom as well. So she wont open for anyone. Please tell me how to deal with this as eventually i would need my stuff or want to bathe and i want it without any fight and with peace

Things were 2% better when dad was alive because he used to tell her to get her act straight. Now that he is no more she doesn't have respect for anyone including my mother. She never had any for her. But atleast dad had a little control on her when she used to create drama in home.