Because there was no one with her.

In the previous chapter, we read that Kamran arrived with her dead body and placed it in the house so that everyone can see it who wished to do so Before he made the announcement of her funeral. Soon women started coming for condolence. Everyone was giving Sana consolation when people saw someone coming in. Sana was shocked to see him she stood up and went to him then kissed his hand and said:

Sana: Kashif! Grandma!

Then she broke into tears, Kashif got closer to the dead body and when he saw that it was Grandma he couldn't feel anything he was speechless then he started:

Kashif: But! How?

Sana: Because there was no one with her.

Kashif: But why? Where were you?

Sana: ...