Board Thread:Episode Discussion/@comment-1599757-20151212162645/@comment-26018514-20151218171735

KNN005 wrote:

If she wants Raven to show up to steal her power, and Raven actually is a maiden, then okay I can get on board with this. But I don't think Raven's a maiden. I think Cinder is sowing unrest and provoking the Grimm and ruinning RWBY and by association Beacon's harmony.

Given that she wields portals and gives the impression she at least has/uses other skills, maiden "magic" tends to best explain her abilities, while being a maiden herself also explains why she left Yang.

Even if she isn't a maiden herself I would wager she is at least protecting one, perhaps even a twin of Yangs(I think this is less likely than Raven herself being a maiden, but because Qrow/Raven indicate twins run in her family it is possible).