I found it ironic that the three Price children: Fanny, William, and finally Susan, had such innate goodness, in spite of being raised partially in the turmoil of lower circumstances.

I began to wonder how ALL of the Price children would have turned out had they been blessed with better material circumstances.

Indeed, there is that God-given temperament that each individual is inborn with that copes with the environment they are raised in, regardless. The superiority of that awareness is apparent with Fanny as it is with William. Now, in Ch 40 it is revealed in Susan:

"......Her greatest wonder on the subject soon became—not that Susan should have been provoked into disrespect and impatience against her better knowledge— but that so much better knowledge, so many good notions should have been hers at all; and that, brought up in the midst of negligence and error, she should have formed such proper opinions of what ought to be; she, who had had no cousin Edmund to direct her thoughts or fix her principles....."