Katrina is still devastated about Carl's condition. But instead of taking care of him, Winnie and Sophie are hassling her about the key he gave her.
When Winnie grabs her and Sophie tries to force the key out of her hands, she becomes furious. In a fit of anger, she pushes Winnie away and wrenches out of Sophie's grasp. She had enough of their vicious planning and bullying. She can't allow these mother and daughter tandem to harass her again.
Sophie catches Winnie just before she falls to the ground. The two gape at Katrina, not expecting her to fight back.
Katrina fixes her clothes and keeps her distance from the two.
Winnie shoots her an incredulous look and screams, "You ungrateful bitch! How dare you hit me! Your uncle isn't dead yet!" We raised her out of kindness, but instead of repaying us, she hits me! She fights us now that normally she didn't do before.