User blog comment:IamJakuhoRaikoben/Chapter 474: In the Moment of Complete Silence, Review./@comment-9595671-20160222225228

If Ultear actually did manage to somehow get young again, the best thing I can think of for how she did?

As there was the one year time skip, perhaps Jellal and Meredy went to find her and see if they could learn why she left since they probably didn't understand it fully, and in the process they found her.

Seeing her current state, they probably tried finding a way to help her since Jellal likely realized the consequence of Face's destruction being a former council member.

Not sure if they did or not or if maybe there was a part of Ultear's Arc of Time magic that helped her, but if she is actually young again they may have found a way.

I hope we learn the answers to Ultear's reappearance soon, the fact she reappeared after what happened in the GMG arc is really making me curious to her return here.