Actually, even if Qinghe hadn't mentioned it, they all knew that she must have eaten all those things. They didn't know when they would be able to dig through, so naturally, they couldn't afford to waste. Moreover, those with leftover food simply put their own provisions with Qinghe's pile. At this moment, everyone became selflessly united.
Qinghe saw what they were doing and, regardless of what they were thinking, such behavior was undoubtedly the best course of action. Given the current circumstances, only by uniting could they hope to survive.