Why does parvana tell nooria to write a note for her mother?

Parvana asks Nooria to write a note for their mother to communicate important information while she is away. This note serves as a way to ensure their mother is informed about their situation and the challenges they face. By doing so, Parvana hopes to keep her family connected and aware, despite the difficulties they are enduring under oppressive circumstances. It highlights the importance of communication and support within the family during tough times.