User blog comment:Malek Kriya/Blake hasn't appeared in two episodes. What to think/@comment-10390252-20130820093502

Here's something worth noting: To date, Blake has had less screen time than Jaune and about equal screen time to Pyrrha. If it weren't for her appearance in the Black Trailer and the Opening, you might be forgiven for thinking that she's a secondary character. This implies to me that she's going to have a real explosion of screen time later on to compensate and that there is going to be some big shock reveal associated with it.

I suspect that, until Blake is fully revealed (including hte big shock reveal - probably that she has non-human heritage), they're creating a certain degree of mystery around her, which Ruby referred to during her introspection in episode 5.