Shang Jinxiu was very surprised; her decision to offer her supplies to Fang Yuxin was indeed sincere, but it had been a difficult decision to make. She was injured all over and weak; once separated from Fang Yuxin, she wouldn't survive long! Unless she found other powerful people to rely on.
But in her opinion, instead of looking for someone new, it was better to stick with Fang Yuxin. This person had saved her, indicating that both strength and character were commendable. Moreover, upon learning she was a Space superpower user, aside from surprise, there was no greed or covetous emotion evident, which made her feel an increased fondness for Fang Yuxin from the bottom of her heart.
Shang Jinxiu had an intuition that following Fang Yuxin was absolutely the right choice.