At any rate, her demeanour changed.

She drew herself up.

Her fine nostrils expanded and a proud look came into her dark eyes, as she nodded her head and murmured in a voice so low that I think I alone caught her words: "Yes, yes, have no fear." Pereira was speaking again (he had turned aside to strike the steel of his tinder-box, and was now blowing the spark to a glow before lighting his big pipe).
"By the way, Heer Allan," he said, "that is a very good mare of yours.
She seems to have done the distance between the Mission Station and Maraisfontein in wonderful time, as, for the matter of that, the roan did too.

I have taken a fancy to her, after a gallop on her back yesterday just to give her some exercise, and although I don't know that she is quite up to my weight, I'll buy her." "The mare is not for sale, Heer Pereira," I said, speaking for the first time, "and I do not remember giving anyone leave to exercise her." "No, your father did, or was it that ugly little beast of a Hottentot?
I forget which.

As for her not being for sale--why, in this world everything is for sale, at a price.