<human>: Can you provide a brief rundown of the text in within 3 sentences?

She's a few years older than me and she's got a very high-powered career, in her late twenties. She's very good at what she does. And she's a very smart girl/woman.
However. She does not eat any oil. Of any kind. She does not eat any meat of any kind. Her diet mainly consists of fruits, vegetables, egg whites and yoghurt. We went to one of the best restaurants in the world, and she refused to eat, even though the waiters were falling all over themselves to get her something she'd like.
She exercises daily, sometimes twice daily, for two hours.
She is obviously unwell. However, she refuses to acknowledge it or discuss it in any way. She tends to stay on good terms with me, but she can barely speak to my parents without accusing them of ruining her life. She holds them directly responsible for all of her problems. Especially since my mother is a doctor, she feels my mother has been particularly controlling. She has completely irrational, unreasonable demands of everyone in our family and it is very difficult for me to cope. It's unbelievably frustrating, and can be very tempting to just level every accusation at her that i have collected.
I don't know if she's at the point of needing hospitalization, but she is obviously doing a lot of damage too, not just to herself.
I don't know what to do. Do i get involved? Do i just let her be? Do i confront her on her behaviours? Please help me reddit.
<bot>: My sister's anorexia and ocd is damading her and the people around her, and I don't know what to do. Help. Please.