Answer:
Her avarice for ancient Chinese art became apparent when it was discovered that she had not only smuggled many of the pieces, but had even killed for a few of them.
If the two burglars had quit while they were ahead, they probably would never have been caught, but their avarice led them to continue committing crime after crime.
I was the only one who knew that her avarice was a symptom of a pathological fear of being poor, which stemmed from her childhood as a destitute orphan.