Being a crocheter and not a knitter meant this was tough.
I scoured the internet for a suitable pattern. On the way I saved every image I could find of Amy that had that scarf. I not only looked at patterns for cable scarves but also looked at patterns that were supposedly made to look like this scarf. Amy has two different knitted red scarves she wears, which apparently confused a few pattern makers. The closest I found to the scarf I wanted was this pattern by Amanda Throm and while it taught me what the standard was for knitting a cable, it didn't match the pictures I had of Amy's scarf. In the end I found nothing that would work.
There was only one thing left to do. Make up a knitting pattern for my first knitting project.
It actually wasn't too hard. I still have no idea how to cast on (I just crocheted a chain the length I needed and picked up the stitches from there), but once I understood the concept of knit and pearl everything else was easy.
So here's my version of Amy's super long, thick, red, cabled scarf. The pictures are of the scarf after a full year and a half of abusive use including being yanked on and dragged around by a toddler, so yours will probably look nicer. I'm not a knitter so I don't know how to properly format the pattern, please forgive any errors. Since making this I've decided that I don't like knitting so this will probably be the only knit pattern you'll ever see on this blog.