Prior to the events of the game, she and Sammy rob the Vikki and Vance Casino and take Vance's lucky hat, Vikki's bonnet, and Vance's 9mm submachine gun. Although they get caught by Primm Slim, Pauline hacks into him while Sammy steals all of the loot. Afterwards, they head back to Westside to plan a big heist that involves robbing one of The Strip's casinos. Regardless of the fact that both she and Sammy state the only gun they possess is Vance's gun, if she becomes hostile to the player she will equip a separate submachine gun.
There is no Karma or reputation loss for killing either of them and taking their hats, but they do not drop the key or code to the safe when they die. The PC must either pass the Speech check of 55 or pick the very hard lock that requires 100 Lockpick if they wish to open the safe and retrieve Vance's 9mm submachine gun.