I didn't say all of the RH ballads, Jim. Child gives 40-odd different ones, most of which only existed in the various 17th/18thc RH Garland.
Without checking, the 10 or so still found in oral tradition in the 20thc can be traced back to shortened 19thc broadside versions. I'm sure Ruaridh's grandmother did have a fragment. The recording is actually on the internet somewhere along with her other songs.