Human Servant to Yasmeen
Marguerite is extremely jealous of Yasmeen, even though the master vampire treats her very poorly.
Circus of the Damned
She has a battle with Anita, ostensibly to fight for the right of Yasmeen, however, Anita chokes her into unconsciousness.
When Yasmeen is killed by Alejandro, Marguerite scratches her eyes out. It's not entirely clear if she is still alive at the end of the novel.