User blog comment:Water Dragon Slayer/DREAM BATTLE CHRONICLES: FOURTH MATCH!/@comment-11966702-20130807140132/@comment-122.144.120.94-20130808034709

Virgo was only seen using her chains in a filler arc. It's not official that Virgo can really use Chain Magic.

OR

Virgo just uses the chains as weapon or tool just like Lucy using her whip (I forgot its name).