its stuck in my head and i really wanna re read it. It was about a girl getting isekai into the body of a sickly noble girl who was sent to a villa far from their family and died before the person possessing them entered the body. The protagonist has only a few months to live and fights to live. There was a part i remember where the protag finds letters that the og owner of the body received from their father whom she thought abandoned her, and never opened the letters. Also another part i remember was she painted a white bird flying free in the sky and she painted it 3 times and sends one to the og owner of the body's father to tell him that shes free like a bird. there was also a black haired knight love interest and he often took the girl out into the garden. i have been looking for this for literally a week and ive almost gave up