Final answer:
The provided texts do not directly answer the question about the specific dialect used by women in China to form support networks. The historical context indicates diverse languages and scripts across East Asia with a significant emphasis on Confucian and Daoist ideologies affecting women's roles.
Step-by-step explanation:
The written and spoken dialect used by women in certain regions of China for communication and to form support networks is not directly mentioned in the provided texts. However, the historical context provided suggests a period where various languages and scripts were developing, and women had specific social roles within East Asian cultures. Notably, the given material discusses the influence of Confucian and Daoist ideologies, particularly in the works of Ban Zhao, who provided guidance to women on how to avoid legal divorce or to be better educated, among other things. Additionally, the material indicates that during certain periods, especially during the Tang dynasty, women found ways to express themselves through poetry and formed connections with each other despite rigid gender roles and societal expectations.