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No I don't think she is autistic. I have worked with autistic kids and adult and a nephew is on the spectrum and she is not a bit like them.
She is just so over anxious that any change that she would not benefit from will set her off. TBH I think she does play on it a bit now as sometimes, when I know she is not that fussed she smirks if she thinks I can't see her.
She has always been the screamy one. We did joke about changing her middle name from Katheryn to screamy girl lol she has just continued in the same vein and got, well not worse but differently screamy in puberty.
Her choice of clothes are not in any way repeating a 'look'. That would make her part of a group and she wants, but doesn't want to be part of a group so no goth clothes, no girly clothes, no dress up or dress down clothes. Just clothes she thinks will make her less noticeable. Boys shoes, tops and trousers. And before anyone asks no She doesn't want to be a boy or transgender. She simply doesn't want to be like the other girls. BUT BUT BUT she so desperately wants to be part of it with them.