The reference suggests that Shallum had no sons (Zelophehad, Numbers 27:1) and (so) employed his daughters in the work. Whether they did the actual work or were directors over workers is immaterial to their participation in the project. As this is the only mention of female workers on the project, we could with a measure of certainty conclude that their involvement was unique.
12 Next to him Shallum the son of Hallohesh, ruler of half the district of Jerusalem, repaired, he and his daughters.