Who is Justine?

In the novel Frankenstein by Mary
Shelley, the character of Justin Moritz refers to a servant in the Frankenstein estate
who became a confidante and friend of Elizabeth. The quote that you can find as to why
she arrived at the Frankenstein estate is as follows (as told by Elizabeth
herself:

Madame Moritz, her mother, was a widow
with four children, of whom Justine was the third. This girl had always been the
favourite of her father; but, through a strange perversity, her mother could not endure
her, and, after the death of M. Moritz, treated her very ill. My aunt observed this;
and, when Justine was twelve years of age, prevailed on her mother to allow her to live
at her house.

So basically Justine was morally
abandoned by her mother and Elizabeth's aunt rescued her.  Another thing about Justine
is that she was in a weak position as a servant, for which she became falsely accused of
killing William and was executed for it to the dismay of the Frankenstein clan, whom
embraced her as family, educated her, and treated her as a favorite. They also were
convinced of their innocence.