Evidently the owner of the carriage is in the shop making purchases, whilst Perpetua sits without, awaiting her.
"Were you going to cut me ?" cries she.

"What luck to meet you here.

I am having such a _lovely_ day.

Mrs.Constans has taken me out with her, and I am to dine with her, and go with her to a concert in the evening." She has poured it all out, all her good news in a breath, as though sure of a sympathetic listener.
He is too good a listener.

He is listening so hard, he is looking so intensely, that he forgets to speak, and Perpetua's sudden gaiety forsakes her.