The painting shows the Visitation of Saint Elizabeth to the Blessed Virgin Mary and is an illustration of a scene from the Gospel of Saint Luke (1, 39-56). Unfortunately, archival sources do not reveal the author of the work. However, one can establish an approximate time of its creation - around 1630-1651, i.e. in the time of creation of the whole reredos.
Maria Działo, "Predella painting – Visitation of the Blessed Virgin Mary", [in:] "The Sacred Lesser Poland Heritage", 2022, source: https://sdm.upjp2.edu.pl/en/works/predella-painting-visitation-of-the-blessed-virgin-mary