I know that Julia was asked to go to the Magic specifically for the start of the European season and because they are making some adjustments to the Concierge program on that ship (I'm sure the fact that she speaks English, German, and Spanish fluently also figured into them asking her to go). It may very well be that she will do that for 1 contract and then be back on the Fantasy.
She is a wonderful host, and she and her husband clearly seem to love working for
DCL, so I wouldn't be surprised if you ran into her again.