Ilia is a member of the White Fang.
Ilia's parents enrolled her in a prep school in Atlas and gave her a strict set of rules to hide her Faunus heritage, showing their desire for her to live a normal life free of discrimination.
Through the White Fang, Ilia is brethren with the two fox Faunus. They know her well enough to be aware that she has a history with Blake Belladonna and to inform her of Blake's return. In "Welcome to Haven", according to Blake, they blamed Ilia and they were disappointed that she is working for Adam. However, they had already met with her prior to this and after she'd had her Scroll taken.
Though they have not interacted onscreen, Ilia knows much about Adam's plans, information she had stored in her Scroll before it was seized by Blake in "Two Steps Forward, Two Steps Back".
Blake's return to Menagerie is mentioned by the Albains as something that would be of significance to Ilia. During their altercation, while Blake is still unaware of her identity, Ilia does not attempt any direct or harmful attacks on her. When they see each other, Ilia appears to be saddened and tells Blake that she should not have come back.
Later, in the "Volume 5 Blake Character Short", it is shown that the pair used to be close, with Ilia confiding her past to Blake in Forever Fall. Near the end of the short, Ilia rescues her associate from Blake, but again takes no direct action against her.
In "Welcome to Haven", Ilia begged Blake to leave Menagerie before it too late, but she refused.
The two first meet with an immediate confrontation, due to her being caught spying on him and Blake. In "Two Steps Forward, Two Steps Back", she wounds and renders Sun unconscious with her whip to prevent him and Blake from chasing her.