Abby Ginzberg has made a lot of films. None, however, were quite as important to her or as personal as “Labors of Love: The Life and Legacy of Henrietta Szold.”

Ginzberg, as it turns out, is a distant relative of the titular Szold and the granddaughter of a man who played an important role in her story. For this reason, and others, she spent years in preparation to create the documentary focused on the pioneering Zionist and founder of Hadassah, the women’s Zionist organization…