In a flashback in Red Queen, Kara is in charge of the food inside the bunker. Octavia wants to know if they can survive for five years with the food that they have in storage. Kara tells her that the overpopulation of the bunker will inhibit them to survive for longer than five years.
Seeing as the only solution to the problem is a population reduction, Kara decides to take matters into her own hand, and leads an uprising against Octavia in order to save her people, by sealing off the bunker's farm from the rest of the clans, leaving them on the other side of the door to starve to death. She then has Marcus Kane and Abigail Griffin locked up. Octavia and Thelonious Jaha manage to open the door. She then tries to kill herself, by shooting herself, to avoid the slow and painful death that she believes Octavia is preparing for her. Octavia stops her by throwing a knife into her hand.
She is then seen in the Gladiator Ring with the other people who broke Wonkru's law. Octavia declares that all the prisoners will fight to death as in a conclave, the winner being rewarded with his/her life, and throws her sword into the ring. Kara is the fastest to go pick up the sword and becomes the first person to win the fight and get out of the ring.
Six years later, she is standing next to Octavia with tattoos on her forehead and holding a spear. She is now a member of Octavia's close guard with Nathan Miller, Indra, and Gaia.
In Pandora's Box, she is still standing next to Octavia. She watches Marcus Kane fighting with the other Gladiators. The next day, she is again at Octavia's side to watch Kane's second fight.
In Shifting Sands, she advises Octavia, Indra, Clarke Griffin and Bellamy Blake about the food supply running low. She then marches into the Dead Zone with Octavia, Nathan, Indra, Clarke Griffin, Bellamy Blake, and some other Wonkru members.
In Exit Wounds, when Diyoza offers food, protection and jobs in the valley if Wonkru surrender, Octavia asks Cooper to send patrol that would shoot and kill any defectors caught going towards the Prisoners' ship. When Clarke and Bellamy propose her a plan as using Echo as a spy, Octavia renounces to kill defectors. But later, Kara kills many Wonkru defectors before stopped by Clarke and Bellamy. She learns them that Octavia knows it and gives order to her. They confront Octavia who states that she had only promised to let Echo go. And if she was to just let them go without resistance, Diyoza would be suspicious.
In Acceptable Losses, Cooper is noticed by Clarke and Monty, bringing in a body and locking it up in a biolab. When Cooper walks out, they break in and find that she's breeding the worms that attacked them in "Shifting Sands". They inform Bellamy about it and figure out that Cooper is planning on infecting one of the defectors with the worms so that they can use them as a weapon to attack Diyoza and the prisoners at the valley. But that means their friends at the valley would die too. Since Octavia wouldn't listen to Bellamy or Clarke, they go to Indra about it. Indra is shocked. She goes to the bio lab and mercy-kills the surviving defector who was being experimented on. Octavia and Cooper meet them in the lab. Octavia admits that it was her idea. Cooper reports to Octavia that the survivor had lasted long enough for them to send a spy to reach the valley and spread the worms. Clarke, Bellamy and Indra confront Octavia about her plan and the fact that it would kill their friends. Octavia refuses to listen to them saying that they have to do whatever it takes to survive. Their friends deaths would be acceptable losses.
In How We Get to Peace, Kara is seen with Octavia. Clarke, Bellamy and Indra hatch a plan to kill Cooper with the worms; then destroy all the worms and make it look like an accident. Later, Kara is seen with Monty in the bio-farm, sympathizing with him. Suddenly, she hears a noise. When she approaches to see what it is, she is chloroformed by Bellamy and Clarke appears. Monty is shocked and Clarke explains to him their plan to save their friends. Even though he's against it, Monty agrees to help them, saying that they are no longer close to a murder. Kara awakens in her biolab and discovers, horrified, that the worms have been released on her and that Clarke and Bellamy are responsible. She pledges them to help her but they refuse. Furious, she says that they will pay for this before the worms kill her. Sadly, Clarke and Bellamy look her at her body.
In The Warriors Will, Kara appears in archive footage.
In The Dark Year, Kara appears again in a flashback, two years after Praimfaya. She is in a meeting with Octavia, Abigail Griffin, and Marcus Kane telling them that a fungus has destroyed the soy bean crop. Abby says there's only one solution, cannibalism. In the cafeteria, she, Indra, Niylah, Nathan Miller, Eric Jackson, Abby, Marcus, and Wonkru are ready to eat the human meat. Kara gags as she eats it.