She did not stop to wonder whether she was perfectly sure that the Kid was with Chip.

She took it for granted and dismissed the Kid from her mind, and worked to save the woman.
Yes, the little diversion of a prairie fire that would call all hands to the westward so that the Kid might be lured away in another direction without the mishap of being seen, proved a startling success.

As a diversion it could scarcely be improved upon--unless Florence Grace Hallman had ordered a wholesale massacre or something like that..