In other words, Zhan Yihe was the cousin sister of the Zhan siblings — Zhan Yuheng, Zhan Shuyu, and Zhan Lichuan.
Zhan Yihe obviously knew who Jing Qian was.
Although she wasn't the direct granddaughter of Master Zhan, she was still part of the Zhan family. Hence, she was still considered a real Miss from a wealthy family. Therefore, she had always looked down upon girls like Jing Qian, who came from a poor family but was now part of the Zhan family in order to bring them good luck.
However, she knew that even if this woman had nothing else aside from her looks, she was still one of her great uncle's favourites. Being that Jing Qian was the person who was brought in to counteract the Third Brother's bad luck, Zhan Yihe naturally wanted to use the chance to show herself in front of the person that Master Zhan liked.