Actually, her memories of her childhood were very vague and she could hardly remember anything.
She only vaguely remembered that when the apocalypse first arrived, her parents died at the hands of zombies, and she became an orphan. She was quite young at that time, but she couldn't remember exactly how old she was.
She didn't see her parents die at the hands of zombies. Perhaps she had seen it with her own eyes and was so shocked that she forgot about it.
She could not remember what her parents looked like, nor did she see any photos or videos of her parents.
After her parents passed away, she reckoned that her parents did not have any relatives or friends, so she was forced to live on her own.
