Sabre being spoiled

I know that other people see it too. Sabre is so sheltered in her life that she acts younger than Naz at the age of 20. She is obviously jealous of her other siblings for being able to develop at their correct age. I simply find it annoying that she is so immature. No 20 year old cries and screams during another kids birthday because they have to go on a walk. 🤣