In HSDS Chapter 23, when seeing Zhang Wuji for the first time at Green Willow Mansion, Zhao Min mentioned that Zhang's father was nicknamed "Iron Brush Silver Hook" and was a great callgrapher, so it seems that she knew about Wuji's father Zhang Cuishan. But in the next chapter, she clearly didn't knew Zhang Sanfeng was Wuji's grandmaster, nor did she knew Wuji had anything to do with Wudang.
Is it just me, or is this a Jin Yong goof-up?