She went to all the general entertainments.

She was invited to all the houses when failure to invite her would have seemed pointed--but only then.
She did not think much about herself; she was fond of study--fonder of reading--fondest, perhaps, of making dresses and hats, especially for Ruth, whom she thought much prettier than herself.

Thus, she was only vaguely, subconsciously conscious of there being something peculiar and mysterious in her lot.
This isolation, rather than her dominant quality of self-effacing consideration for others, was the chief cause of the extraordinary innocence of her mind.

No servant, no girl, no audacious boy ever ventured to raise with her any question remotely touching on sex.

All those questions seemed to Puritan Sutherland in any circumstances highly indelicate; in relation to Susan they seemed worse than indelicate, dreadful though the thought was that there could be anything worse than indelicacy.
At fifteen she remained as unaware of even the existence of the mysteries of sex as she had been at birth.