We've tracked her down, but unfortunately, she's not willing to return to her post until our next patch. We'll be speaking to D'Tan about this...
((We're looking into why this occurred and will track down a fix for our next release to Holodeck. I visit her daily normally, so I can empathize with you that it will be inconvenient to have her missing until then, so our sincerest apologies in advance. I will add this to the list of known issues in the patch notes.))
Brandon "BranFlakes" Felczer | Former Community Team Lead for Perfect World Entertainment