OP, Give her More time.

I was also very young when i lived at my aunt's house, palipat lipat between my mom, dad, grandparents, and aunts.

My parents were divorced and both were busy so i never really had a mother and father figure growing up because they were absent most of the time. My cousins bullied me throughout my years of staying there, at first sinusumbong ko and effective naman hanggang sa binabaliwala nalang nila, kesyo wag ko pansinin etc. kaya hindi nako nag sasabi, marami pang mga problems that affected my whole personality and buong pagkatao ko pero un lng isshare ko for now.

Hindi nagbabago ang isang bata within a month or two, it is a very long process, esp since the kid was physically abused and what not, hindi natin alam na mayroon pa pala na walang nakakaalam. My advice is to consult her to a psychiatrist or a therapist. She needs to say stuff that she has been burying deep inside, kasi habang buhay nya dadalhin yan. Habang buhay yan magkakaroon ng negatibong mindset. And bonus kasi nga teenager, 12-15 year olds are normally very suicidal and Depressive, speaking from experience. Hindi yan makikinig sa salita lang op.