Here she is!
Hmmm! She got her lace upside down in more ways than one!
Anyone who makes handmade lace will know that the straight edge, which she called the header! is referred to as the foot, or foot-edge, and the outside curved edge is the head or head-side.
That type of lace (warp knitted) DOES have a right and wrong side. The way the machine makes it is to lay the main threads down into the required positions and then a series of parallel chain stitches hold it all together. Those stitches show as chains on the wrong side and a single thread stitch on the right side. True it's more obvious in some laces than others, but I think she got it wrong in both the sample and the demo.
Neat use of the overlocker though.