[Khorne's Fist]

This is from Wraight's Wolf King:

"Geri looked up at her master, golden eyes unblinking."

So, from this, you read that not only that Geri is a failed aspirant, but also a female failed aspirant? That's stretching it a bit.

All the fluff that has ever mentioned them has said they were part of the pack that took him in when he landed on Fenris. There has never been any proof that failed aspirants turn into wolves. Some do fall to the curse of the wulfen, but as we've seen with the 13th company, they are your common-or-garden werewolves, as opposed to mutating into proper Fenrisian wolves.