User blog comment:Miskos3/Fairy Tail 544: You're the King, Review/@comment-25683773-20170715131609/@comment-7418318-20170715132026

Last chapter she was outside of the circle, but then Carla pushed her in, probably less because she can contribute and more out of friendship than anything else.

But since we never learned the exact way how her loss of magic works, it's also possible that Chelia still has magic power in her body, but is unable to cast spells with it. That would still leave her able to supply said power to others.