Final answer:
The provided texts do not directly answer what indicates to Kya that her mother may not return, but they showcase the themes of loss, separation, and longing.
Step-by-step explanation:
The passages provided indicate a common theme of loss and the emotional impact it has on those affected. In the context of what signals to Kya that her mother may not return, none of the provided texts directly answer this question. However, themes of separation and longing for one's mother are apparent, which can parallel Kya's situation.
For example, in one text, the absence of the mother leaves a child in a state of hope, inviting her to return. While the details of Kya's situation are not disclosed, the literature samples suggest the profound effect a mother's departure can have on her children, perhaps leaving them with a sense of finality or despair.