Huo Yingcheng wouldn't ask out of the blue. But if they refused to tell her, there wasn't a way for Gu Qingjiu to find out more.
When they got back to the hostel, it was already very late.
So late that the hostel building was already locked. Gu Qingjiu couldn't very well find the management to open the gate at the risk of alerting her superiors.
After midnight, the management absolutely wouldn't open the gate for the students.
Even for Qi Xiaoran, she would at most return right before it hits midnight.
The standard time for lights out for students was 10 in the evening.
As she sat in the car, she started feeling drowsy. "The hostel already locked the gate…"
If she had known earlier, she wouldn't have come back.
She simply thought that there wasn't anything she could do over there anyway, and she hadn't expected that she wouldn't be able to return to the hostel after coming back.