Answer:
What she says about slaves being a property is:
“You see there was slave traders in those days, jes’ like you got horse and mule an’ auto traders now. They bought and sold slaves and hired ‘em out. Yes’m, rented ‘em out. Allotted means somethin’ like hired out. But the slave never got no wages. That all went to the master. The man they was allotted to paid the master.”
Step-by-step explanation:
As can be seen in the paragraph above, Aunt Sally states that slaves are treated as property, because, like objects, they are sold, bought, lent and rented. They work and receive no wages at all, they have no right to anything, nor the very life that belongs to their "master" as everything related to slavery.