Her feet and the seam of her short dress brushed in the snow and tore up the surface.

She felt the looser stuff beneath foam about her gaiters, but this was an advantage.
The drag would help to stop the sledge, and if she could put an extra pressure on one side, to some extent direct it.

Still they were going very fast and at first she was nearly pulled off.

She tightened her grasp with her hands until she felt her gloves split, and then risked another glance ahead.
The rocks were very close, but the sledge had passed the top, and she could see a few yards down the dark side as they followed the curving edge of the crag.

The sledge was now running nearly straight down the hill, but the curve bent in towards them, and she could not tell if they would shoot past the widest spot or plunge over.
"Perhaps you had better let go," Thorn said hoarsely.
Grace shook her head.