They had driven almost all their sheep to the home ranch of the big owners, thinking they could be protected better there.

They had gathered all the men available, and these were at the ranch, awaiting an attack.

The woman's flock was too far away to be driven in, and she had been left in charge because the sheepmen had thought that the cowmen would not harm her.
With this knowledge gained, the party wasted no more time on the woman or on her scattered sheep, but started off for the bigger game.

When Injun and Whitey arrived on the spot, the woman had nothing more to say.
She possibly felt that she had talked enough.

Besides, she was busy smoking a pipe and waiting for the clever dogs to gather the scattered flock.