Anna Corinne Von Helson is one of the 'Von Helson Sisters' alongside her twin sister Marie Von Helson. It was later revealed later that she was actually the half-vampire daughter of Vladimir Von Helson.
She and her sister lived undercover as humans until the events of 'The Vampire Conflict', where their father returned to war against humans.
Later in the storyline, Anna Corrine starts dying her hair-tips red to match her sister.
It can be assumed that Anna Corinne was injected like Ian to hide her vampire characteristics.