Belannariel, or as she preferred to be called, "Blink", never took kindly to rules. To her, rules were just there waiting to be broken. Just like that lock over there that was supposed to be keeping folks like her away from the goods inside. Of course petty theft can only keep someone entertained for so long before they start itching for a bigger payload.
If the talk around town was any indication, there was money to be made in them there hills. Or, more realistically, in the ruins on them there hills. And potentially under her feet. Surely some historian, inventor, or merchant would pay big bucks for some scavenged artifacts from before the cataclysmic events that tore the world apart. And maybe she'd find a few goods for herself.