From Halopedia, the Halo wiki
Needing to find a cash machine with a video phone, Sadie Endesha entered a casino. The casino was being vandalized by the Crone and other looters. Vergil generated fake police sirens in an attempt to scare off the looters; the Crone, however, recognized the noise as a "neat little trick" and continued to loot the building.
The Crone took Sadie at gunpoint while prying open a cash machine. When a Covenant Phantom landed outside, Sadie took cover, but the Crone continued to loot the machine. A Brute attacked, ripping the machine off the wall and pinning the Crone beneath it. Believing that the Brutes were after "her" money, the Crone attempted to defend it; she failed to fend off the attackers, and one of them executed her with a Mauler.
The Crone was evidently a compulsive gambler who felt she was owed the money she lost by the casinos and that this justified her actions. She also called Sadie a "slut" despite apparently having never met her before, most probably because she was spouting inappropriate drivel in her maddened state.
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