Sister Orsola created religious genre paintings, altarpieces, and still lifes which varied little over the course of the fifty years she painted. Most of her works convey the repertoire of figurative models and types of composition that she studied in her father's studio during her adolescence.Fonturnati, Vera, Jordana Pomeroy, and Claudio Strinati. “Orsoloa Maddalena Caccia”, Italian Women Artists: from Renaissance to Baroque. Washington, D.C.: National Museum of Women in the Arts, 2007. pg. 216 In comparison to her many altarpieces and religious paintings, Sister Orsola created few still life works. She commonly inserted pieces of still life in many of her religious works. These elements of still life are a reflection of the types of objects she had access to in the convent and could study from. Many of her still lifes are considered unusual and notable in their invention and stylistic quality. Each element of her still lifes is meticulously placed and balanced by other figures in the composition. She also depicted various species of flowers and other plants in her works. Orsola's paintings are recognizable as her creations since they are filled with spirituality and are lifelike in their precision. As the years go on, more of her works continue to be discovered and are correctly attributed to her after initial mislabeling.
