I do not think she had an addiction, but ones she got into the wesen world, she couldn't just turn it off and pretend it didn’t exist. Juliette wanting to be part of Nicks Grimm adventures was a piece off the puzzle. Her main reason for taking part in reversing the spell was for Nick to be able to protect his wesen friends, and keep himself and Juliette safe, given how vengeful wesen could react. When it comes to Juliette turning into an evil hex, she had a joint responsibility. Not only did she want Nick to be a Grimm, but she supported and helped covering up the kidnapping of Diana, which triggered all of this in the first place.
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