She grew old, and started driving herself crazy. She would see bizarre mirages, & start seeing Sam. She would talk to Sam every day, until Trout Walker found her and demanded for Kate to show him and his wife where the loot was. Kate raised her gun, but then tosses it aside. Then after considering that she would be better off dead, she lets a Yellow Spotted Lizard kill her.
'She knew she was crazy. She had been crazy for the last twenty years. "Oh, Sam," She would say, speaking out into the vast emptiness. "I know it's hot, but I feel so very cold. My hands are cold. My feet are cold. My face is cold. My heart is cold."Kate could smell Trout Walker's dirty feet. "You've got exactly ten seconds to tell me where you've hidden your loot," says Trout "Or else I'll blow your head off." "Go ahead and kill me, Trout," says Kate. "But I hope you like to dig. Because you're going to be digging for a long time. It's a big vast wasteland out there. A lizard leaped toward them. Kate could see its big red eyes. Linda tried to hit it with the shovel, and Trout shot at it, but they both missed. The lizard landed on Kate's bare ankle. Its sharp black teeth bit into her leg. Kate smiled. "Start digging," she says. "Where is it?" Linda screeched. "Where'd you bury it?" Trout demanded. Kate Barlow died laughing.' (Sachar:1998)
She murdered countless people, before kissing them before their last breath. Besides murdering innocent/guilty citizens, she also robbed many banks as she could. She was scarred for life, witnessing Sam's death. So she avenges Sam, but kind of goes too far.