User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 42: June 2015/@comment-1153699-20150702021033

Cana didn't give Freed (when he wasn't even using his Devil Form) much trouble when they fought. Juvia on the other hand, gave Gray (who I think is superior to Devil Form Freed) a good fight and had the upper hand against Meredy once she was fully serious.

Besides, Hiro himself stated Juvia was the 3rd strongest woman in the guild followed by Cana.

So yeah.. Juvia's got this one that's for sure.. And I don't think she'll even have a hard time as well (assuming both of them fight to the best of their abilities from the start).