The Mourning Mother is one of Alfred Drevis's test subjects who Aya meets early on in her quest, and Collina's mother.

It can be assumed that the mother and her daughter, Collina, moved in to live with the Drevis family, with the mother becoming a servant. At some point, Dr. Alfred uses her daughter to test out some new medicine he made, presumably without the mother's knowledge, which results in a violent end for Collina. It can be assumed the mother eventually learned of this, though was unable to avenge her daughter, and was presumably killed and turned into a doll afterwards.