C99 Antecedent

After Xia Ying fell, she didn't get up for five or six days. She was ill, and very ill.

She spent the next few days in a daze, and when she was asleep she slept much more than when she was awake. Even if she woke up, she was too weak to even lift a finger.

On and off, however, Gu Tuo and his son kept watch by the head of the bed and knew what was going on