User blog comment:IamJakuhoRaikoben/Chapter 394: Juvia vs. Keith, Review./@comment-24069151-20140725143348/@comment-7418318-20140725144135

Did she ever learn of Silver's name (I don't remember)? Maybe she thought that Silver was just an alias he had as a pretend member of the Demons and didn't want to use it because of that.