My younger sister

My younger sister has developed really bad habits. she'd through stuff around and if asked to pick them up or something she would reply back very harshly. i've been very close to her but i feel that she gets way too irritated annoyed and ill tempered when it comes to regular interaction nowadays. whenever she needs some help regarding her studies she would show up to be very friendly and sweet probably just like how an 8 year old should be. as i mentioned before im real close to her like emotionally attached to her seeing this behaviour hurts me a lot and literally haunts me. recently she threw a shoes at me and when i told her to please let me work and not disturb me as i said

I recommend that you just try to be understanding. It's probably hard for her to live in a world that's always changing, especially because her body is probably starting to change as well. She'll get better, it will take a while but she will.

Throw stuff around WHERE, Ashley - which room? What are your ages?