The first book written about her is "Nihon Miko Shi"(History of Japanese Shaman" by Taro Nakayama in 1930, and the only description given by her in it is that Chiyojo/ChiyoJobou (Sirname unknown) is a shaman priestess who was allowed to manage a Shaman guild within the Kai and Shinano Domains by the Takeda clan during the 16th century. The reference is unknown.

In 1984, Akira Fukuda, a folklore researcher, released a book "Shinto Syusetsuwa" (The Origin of Oral Narratives in Shintoism", describing Choyome was a widow of Moritoki Mochizuki, a vassal and a nephew of Shingen Takeda, who died at the 4th Battle of Kawanakajima, and she was given the leadership status among the shaman community in the area, based on the documents he found at Nezu village in Shinano (the modern day Toumi City, Nagano). Another historian, Shisei Inagaki, claimed that it would be unthinkable for the (former) wife of samurai being a specific profession like a shaman, and Inagaki proposed an idea for the very first time that Chiyome was could have been a leader of female ninja (masquerading as a troop of travelling shamans) which the Mochizuki family had patronized.

Then a historian, Yumio Nawa, wrote a two-page article about Choyome being a ninja in a history theme magazine in 1991, and that's when she became popularized. But as you can see, much of her descriptions are based on speculations and documents that aren't publicly available.