Li Fengling, how could a seventeen-year-old girl die?
The woman seemed to have aged much in one day.
Goodbye means, see you again.
If goodbye means "see you again", then bye means "won't see you again".
The woman looked up at the dazzling sky and seemed to see her daughter Li Fengchi, wearing a white dress, leaning sideways and waving to her with a smile. The mouth opens and closes.
She seemed to be saying, Mom, Dad, bye.
Yes, the message revealed by the mouth shape she saw was, bye.
It's goodbye rather than goodbye.