Elizabeth Mary Maxwell did not exist.
If she ever did, she died on March 10th, 1949. End of story.
Hush was a weapon.
A weapon used by a Nazi/Soviet terrorist organization for their own selfish gain, described as 'the girl'.
A weapon beloved by the fairies like a goddess, described as 'a weapon whose every breath screams death'.
Ellie Maxwell was just Hush's weird, powerless, alter ego.
When she was nine, her humanity was ripped right out from under her.
After decades of torture and abuse and brutality, she got her humanity back.
But, at some point, she ended up willingly giving up her humanity.