What you may not know is that she immediately started another project. This one was likewise in garter stitch -- but all purl this time. And the chart was 40 rows long instead of 25. And she had to make two of them.
Fifteen minutes ago, she finished. And she just learned to pass a stitch over another, which means she did the bind-off herself.
Here she is demonstrating her purling technique. If you are trying to learn, I think you could do worse than to study this closely.