She had not made the view, remember, nor had she advised the snakes to choose that ridge for their dens.

She was not even perfectly sure that they did choose it.

The boys had told her that Black Ridge was "full up" with snake dens, and she meant to see if they told the truth.
Wherefore her horse Tango laboriously carried Mary V up the ridge and kept his ears perked for the warning buzz of rattlers, and his eyes open for a feasible line retreat in case he heard one.

Tango knew just as well as Mary V when they were in snake country.

He had gone so far as to argue the point of climbing that ridge, but as usual Mary V's argument was stronger than Tango's, and he had yielded with an injured air that was quite lost upon his rider.