well she's not really my little sister, she's my sister's best friend, but i watched them grow up together so she's like a sister to me. anyway. she's a cutter, but that is not what i want to help her with. she thinks she might be anorexic or bulimic. she never eats and when she does she throws up. she's always saying she's fat *she's like a size 8-10* and everytime i say something to her she just blows it off.....what should i do?