My older sibling always does unjust things to my or when I have a conflict with a familymember she always give me the fold without having knowledge about what really happend and everytime when I toldher she is unjust in a nice way she becomes angry and close her door and says that I am wrong what to

‎Keep being good to her even if she does not return it. The Prophet ﷺ‎ told the man whose relatives wronged him that as long as he stays like that, Allah’s support remains with him. Do not argue with her each time. Advise her once, gently, at a calm moment, make dua for her, and if needed let a wise relative speak to her.