Anya naturally displayed a lack of trust for the Delinquents and as an experienced leader of the Grounders, she approached them with enmity. Initially, she was one defined by stoicism, but from Anya's protective response to the death of Tris, her young "second", a previously unseen compassionate, motherly dimension to her. Anya was very aggressive towards Clarke in their first meeting, as she tried to assassinate her. Anya was very determined and protective towards her tribe members and even willing to go to a war with delinquents for their deaths. Lexa was Anya's second before she became the Commander.
After deaths of her members by fireworks send by delinquents, Anya and Clarke organized a truce meeting. Anya was very aggressive towards Clarke and tried to assassinate the latter via her assassins, only to be rescued by Jasper who shot the assassins before they can shoot Clarke. This event made Anya more hateful towards delinquents.
Ultimately several days later Clarke and Finn is kidnapped by Anya. Anya threatens Clarke to help her young and sick second Tris, who was suffering a seizure. If she couldn't help her, Anya would kill Finn. Unfortunately Clarke couldn't save tris from death. Anya attacked the couple but Clarke and Finn escaped at time.
After Clarke is abducted again, Anya met with a Grounder named Tristan. Tristan told Anya he will taker over her tribe in the war, because Commander ordered to. Anya accepted, and moments later, they realize the attack of Reapers. Lincoln saves Clarke and Finn on time, while Anya yells. Triston tells her they need to start the war now.
At the battle between Grounders and Delinquents, Anya assisted Tristan in stabbing John Murphy. Later she slips into the dropship and fight with delinquents herself. While delinquents decide what they would do with her, Jasper burns three hundred grounders under Anya's devastation.
Anya sees you days later and approaches What are you doing here?