Everything had changed since she joined the supermarket base, especially after the special blizzard event began,, she even coached Lin Wu in shooting. Perhaps it was out of a begrudging acceptance, a need to coexist under one roof. Maybe it was an inner envy of communal life, since humans are naturally gregarious creatures. Or it might have been just to show goodwill towards Lin Wu, as she already knew of Lin Wu's strength and might need his help with tasks in the future.
Nightmare was the kind of person who wouldn't make someone an enemy just because she didn't like their personality. Just like how people in the 21st century assessed a city, the people here didn't talk about feelings, only value; whether you were valuable to them determined whether you could develop a relationship.