I didn't know, but I figured I could probably find out, and so I asked her for a bit of reconnaissance time. After a google search or two, I found what I was looking for at good old redheart.com
Specifically, I found this pattern. The yarn needed is called Red Heart Sashay, and it's more ribbon than yarn, which accounts for the frills all through the scarf.
And then, I worked up this scarf:
Would you believe that this whole scarf is made up of a foundation chain row, followed by row after row of 4 single crochet stitches? Getting my fingers used to working with the ribbon yarn has been kind of tricky, but not unenjoyable.
Regardless of all of this, the scarf is frilly, fun, and I love the texture of it. I can see me making more like them in the future.
(And I recently taught my young neighbor as well.)