I saved the picture to My Photos, switched to the enlarged version, and rotated her so that I had a fairly good look at the stitches as close up as possible.
I could be wrong but it looks to be nothing more than a K1, P1 across the row with bulky or very bulky yarn on very large needles, maybe 15 or 17; turn and do the same thing on the other side to make it reversible (knit over purl and purl over knit). I don't think there are more than 8 to 10 stitches across the row, but you can swatch to get the width you want.
At first I thought it might be a twisted stitch, but the scarf itself is twisted. The clearest view of the stitches is in the second vertical row from the left.
Hope this helps to get you the scarf you want!