Looking For This Anime That I Cant Seem To Find!?

I saw this anime (or whatever it was, it was anime style atleast) and it was about this girl, who i guess, in the end, had a mother who turned out to be an angel or something. Im not sure, but there was a part where they talked about some angel girl who couldnt go outside cause ppl didnt like her or something and when she tried to escape they trapped her in a cave. o.o something like that. Anywais, the girl was really sick and in the end she died. I also think, that while she was alive some

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