Could it be kind of mixed up with Chin Ping?
Heinz' is correct as the likely candidate, prolly still the ballerina intern attending the studio's Southern drama academy. Even if it were possible to be Chen Ping, she would of been around 12-15 years old so zero in on those screen-caps for the adolescent roles.
BTW, Chin Ping's a tad older than Chen by 2-4 years so I have a bigger problem with Chin's birth year as listed here:
http://hkmdb.com/db/people/bio.mhtml?id=3261&display_set=eng.
That would make her over 40 at the time she may have appeared in 'Dream' and near 50 by the time of her last film 'Price of Love', NOT! We can blame the folks over at Celestial or HKFA for this gaff.
Back to Chen Ping. Yep, she didn't leave her Taiwan home for HK until the early 70s. She's known to have been doing racy Taiwan Indie exploitation since her late teens (like Shu Qi did) and those handful of rare credits aren't listed in any of the DBs...yet.