Board Thread:Q & A/@comment-4097293-20150226082755/@comment-26322846-20150420232139

(P) Macabros77 wrote: Unverganglich wrote: As I understand it, her transformation isn't related to her heratige though. It's being spun as an unexpected and unpredictable side effect of the Verfluchte Zwillingsschwester potion. We discuss this about 3 weeks on other threads. I don't believe in side effects. It doesn't mean I'm right. But I face the possibility that she might have been, like Nick already a Hexenbiest/ Grimm. So I'm searching something similar in the mythology what happened to Juliette. So if the writers doesn't give any answers, we can turn around without knowing who is right or wrong. Rosalee, I don't want to repeat it, said it was a kind of " Verfluchte Zwillingsschwester". In reality it was a kind of  a mirror cure. It changes your look but not your organic structure. But it's o.k. if I'm wrong. (It's only my opinion) XXD

Multiple people, including Sean's mother, also said that there are side effects which can be largely unpredictable, and that it was a relatively risky spell. The spell worked fine, and considering it was prepared by an experienced Hexenbiest, that's of little surprise, but that's not what I'm referring to.

I'm referring specifically to what happened as being a product of Juliette, who was inherently mortal, taking part in a spell which was designed by/for Hexenbiests specifically. It leave a lot of room for unaccountable variables.