I had to swatch a bit of her pattern to understand how it was constructed.
There are two techniques. In one, you make a long strip of garter stitch and then knit down so many stitches and start completing short rows in a lace pattern to fill the triangle. In the other, you knit a bit of garter, fill it with short rows, then cast on additional stitches and fill it with short rows, until you have a long string of points.
I decided the first would be the best for my pattern, but I wanted smaller "wing" points and a larger center point that would work up into a back panel. So I charted out what I wanted and made a rather large swatch.