Of the four girls who became embroiled with Cheung Mo Gei in HSDS, Siu Chiu is not the one whom most would think of as being the best martial artist among them. Most would consider that to be Chow Chi Yerk after she cribbed some of the 9 Yum White Bone Claws, although Chow was never as powerful as she initially seemed after beginning to use the 9 Yum claws.
But what about Siu Chiu? She seemed to have great intuitive knowledge of the Ming Cult's martial arts (most likely because she had been trained by her mother, Purple-Clothed Dragon King Dor Yee See/Granny Golden Flower). Could she have been the best martial artist among Cheung Mo Gei's paramours? We never did see Siu Chiu involved in any fights in HSDS, but she seemed to be a "hidden dragoness."