My sister, she's 17years old but still a junior high school student, ninth grade. She was a really fun, loving person back in early before she turn 14 years old but recently she become so arrogant and never care about her family. She became so egoistic and become a loner. She even stole money from my mom, from her friend and sold anything she has just for fulfilling her need. Once my dad took her smartphone she became so angry and pissed off then start stolen her friend money to bought a new smartphone. Once she got caught my gut she don't regret what she has done. She stat lock herself in her room and tried to injured herself. She became so pissed to everybody at home she hate her family and what worse is she became angry because she doesnt have any smartphone not because she regret any trouble she made. Please I want my sister back what should I do ? I was so disappointed and lose control while talking to her asking her what really happen and she yelling at me and I slapped her. Now I have to make it all right back to the track so please I need your advice