All at once her heart began to patter queerly.

He was bringing the sing-song girl to the hotel! The strange cortege presently vanished below the window-sill.
Curiosity to see what a sing-song girl was like took possession of Ruth's thoughts.

She fought the inclination for a while, then surrendered.

She was still fully dressed; so all she had to do was to pause before the mirror and give her hair a few pats.
Mirrors.

Prior to the great adventure, her mirrors had been the still pools in the rocks after the ebb.