User blog comment:IamJakuhoRaikoben/Chapter 455: Magnolia's Defensive Battle, Review./@comment-24546844-20151005142615/@comment-24546844-20151005154922

This is an interesting theory but right now I, personally, have some problems with the "too much magic power affecting the body" thing. It's something that's been bugging me since Fairy Heart's true nature reveal. Since then I've been wondering: "If Fairy Heart is an unlimited source of magic, how can that crystal handle it without crumbling?" and now with the supposedly absurd amount of magic power each Spriggan have I find it hard to believe that magic power alone is enough to damage someone's body unless there are other factors influencing it as well.

For example: It made sense with Ultear at the time and because she was just kid and couldn't control her own magic flow, and would make sense with Layla if she had some sort of magic disease that made her unable to control her own magic as well. If Lucy had this disease or if Jude believed she would have it and made the "shrinking" thing as a preventive measure or even some other reason related to future events or at Layla's request then your theory would make sense to me but if it's just the "her magic power is too much" then I find it hard to believe. I may be wrong though.