After that eight-month hiatus, I was ready to try again. I went back to Cindy's sock class for inspiration, and took yarn that Mom had chosen. It's Fortissima Socka.
Mom likes high cuffs, so when I saw I had a bunch of yarn left, I took out the cast-on row and knitted upward. Happily, I was perusing my friend Szarka's blog and noticed her comment about binding off toe-up socks and how a regular bind-off won't work. She ended up doing a tubular bind-off, which turns out to be just a Kitchener graft between the knits and the purls of ribbing. So that's what I did, too. Thanks, Sz!