The names of certified write-in candidates, including Shelley Sekula Gibbs, are posted in every voting booth, but the voter has to know to look for it. The polling place I visited had the names printed in standard 10-point black font on white paper posted off to the side of the interior of each voting booth.
Your suggestion is a good one, but if my experience is typical of other voters in the TX 22 district, the Sekula-Gibbs campaign has blanketed the district with information and instructions on the write-in process. I've received at least five mailings at home and three phone calls for Shelley Sekula Gibbs. However, that may be because I'm a Republican voter with a perfect attendance record at the polls.
The National Right to Life newsletter says Ms Gibbs is pro life and they endorse her. This has to be a boost since the prolife organizers often are able to get out the vote very well.
That's all it will take to win this race.