Time to play. I went to my sewing room, which is currently a storage room, and found a cam that made my 1974 Elna SU Supermatic do a perfect blanket stitch from the left to the right, so the bulk of the item is not be under the machine. It doesn't make a very big stitch, but very nice. The built in blind stitches both go from the right to the left. Off to ebay to see if there's a cam that will make a bigger blanket stitch.
That is such a quiet machine. It's not a good quilting machine, so I've been using a Singer 301, but nothing sews like the Elna.
I just went back and looked at the video. The stitch she used looked very much like the Elna's blind stitch, not the blanket stitch. The blanket stitch cam makes a stitch like Kitsie's pictured one, only smaller. The cam puts down more thread and will show more. Side note - how do you put DMC embroidery thread on a spool?