Not only did she threaten to take advantage of her customers' ignorance, but also, to Gray's anger, she displayed a poorly veiled contempt for and amusement at his charges.
Allegheny was not long in feeling this.

She had entered the establishment aquiver with hope and anticipation.

This was her great adventure.

She was like a timid child, enraptured at sight of its first tinseled Christmas tree; to have that ecstacy spoiled, to see the girl's tenderest sensibilities wounded by a haughty clerk, enraged the man who played Santa Claus.

Abruptly he resumed charge of the Briskow purchases, and it gave him a pang to note how Allegheny ran to him with her hurt, as it were.
But matters did not progress as well as he had expected.