Board Thread:Q & A/@comment-4097293-20150226082755/@comment-26322846-20150420185900

I think you guys are looking too much into it, and I don't think Juliette was already a Hexenbiest, in remission or otherwise. When she went to Henrietta to test her blood, Henrietta said she's never seen anything like it.

I'm thinking it's a strange side-affect as a result of a human performing a risky and unpredictable spell in part with the Zaubertränke.