Hello! I believe you are asking about Katniss Everdeen from the novel The Hunger Games by Suzanne Collins.
When Katniss Everdeen takes her sister's place as the District 12 female tribute, she finds herself in a stressful situation. As her family's main breadwinner after the untimely death of her father, she knows that her mother and her sister are dependent on her for their survival. As a tribute, she will not be able to fulfill her domestic responsibilities and she will also have to fight Peeta Mellark, the chosen male tribute for District 12, who is her friend.
Katniss' mother falls into a deep depression after her father's death. Consequently, Katniss has always felt abandoned by her mother. Katniss's mother and sister, Prim, visit Katniss while she is in custody at the Capitol. She warns her mother not to accept tesserae for Prim. Families living in poverty are awarded a year's supply of grain and oil (tesserae) for extra entries in the Reaping. Katniss does not want Prim to be chosen as tribute. She warns her mother not to leave again and makes her promise to take care of Prim:
“You can’t leave again,” I say.
My mother’s eyes find the floor. “I know. I won’t. I couldn’t help what—“
“Well, you have to help it this time. You can’t clock out and leave Prim on her own. There’s no me now to keep you both alive. It doesn’t matter what happens. Whatever you see on the screen. You have to promise me you’ll fight through it!”
She tells her mother that they must survive by selling Prim's goat milk and cheese. There is also her mother's apothecary business to rely on. Katniss tells her mother and sister she loves them as they leave.
Thank you for the question!