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The fact that the parents will be able to care for her themselves will deter abuse.
Her being small keeps that possible.
Now she'll not have to be cared for intimately by strangers in an institution (or at home) once she gets too big for her aging parents to look after. Certainly not all people caring for the severly disabled aren't abusers -- but they aren't loving parents either.
The "if she were a boy..." assertions seem to be missing the point -- they basically MADE her a boy. She won't menstruate, she won't grow breasts. There is nothing comparable to DO to a boy. I suppose with a similar boy they'd stunt his growth and leave it at that. (You can all put your castration fears back in your subconscious again. Where they belong.)
As far as her "sexual pleasure" the only pleasure she'd have ever appropriately had she still does if she ever finds her clitoris.
"Pillow Angel" certainly seems creepy. "Breast buds" makes me wince every time I hear it -- it DEFFINATELY sounds creepy. The whole thing is discomforting and SHOULD be, its not a decision that should ever be made lightly.