User blog comment:IamJakuhoRaikoben/Chapter 447: Escape Battle, Review./@comment-7418318-20150805221320/@comment-25111584-20150807143306

@FTF: It's not me saying it. She says that her Magic Power (魔力 Maryoku) increases. That refers to her reserves, as you can see here. Sure, you can have interpretations different from the wiki's, but I don't see why Maryoku would mean anything other than Magic reserves to you. ._.

And it's hardly OP. Just a small boost. And nowhere has it been said stack, so we can make our theories about that. ;) Just think of it as an extremely weak version of Shadow Drive or Dragon Force.

@Nick: lol, you speak as if we have never seen any amplification techniques. Or as if no Magic has allowed the user to tap into their potential. Carla has just found a way to convert some of her potential into usable energy by being smart rather than brute training. ;) And it doesn't have to stack.

" And in the crowded vehicle, being smaller would even have helped a bit more... "
 * That's what you said. I thought that was about comfort. I seem to have misunderstood, could you please tell me what you meant?

Just because somebody doesn't have a chance to use their abilities doesn't mean having a bit more power is not being prepared. In the Avatar arc, Lucy was absolutely no use in the Star Dress and actually ended up being a hindrance to Natsu, but doesn't mean she shouldn't have changed into the dress. She was just being prepared, like Carla here. Doesn't matter that both turned out to be completely useless, although the latter didn't turn out to be a nuisance at least.

And there is a bit too much room in here and too much sand about for a smaller form to be more useful than a bit more power.

Also, just like Carla's power doesn't seem to help, I don't really see her getting in the way either. ._./