With her limited training in the 9 Yum Jen Ging, Chow Chi Yerk was only able to attain a martial arts level around that of the more powerful Mo Dong Heroes by the end of HSDS. She was still young, however. Do you think she continued training in the 9 Yum Jen Ging post-HSDS and eventually became a Greats level fighter? I think she gave the 9 Yum Jen Ging manual to Cheung Mo Gei before the story ended, but she could have memorized the text as so many others before her (i.e. East Heretic Wong Yerk See's wife, Chow Bak Tung, Gwok Jing, Wong Yung, etc.) had.