why will she go out?

In the previous chapter, we read that Grandma took Sana to her home in the middle of the night. So when Kashif and Kamran woke up they were worried about not finding her, then Kamran suggested:

Kamran: I think to find Sana we must go out of the house or we must also check in her house too maybe she had gone to her house.

Kashif: how can that be I was up till midnight why will she go out, to her house in the middle of the night

Kamran: yes you are right but we have no other place to find her now the other questions will be answered after we find her.

then they went out of the house when they saw that the lights of Sana's house opened they were surprised And went to her door and rang the bell :

Grandma got up from the dining table and came to the door and asked:

Grandma: Who's there

Kamran: it's me Kamran and Kashif is also here with me

Grandma opened the door and said: