Actually, they were gonna put multiple poses for everyone but that got cut due to time and other restraints, they added older poses before the initial release due to those restrictions being lifted.
Its pretty plausible that Filia's parents died in a Mafia hit because they betrayed the family or whatever.
In which case, the Medicis don't want her back (and probably think she's dead anyway).
Random Speculation - Filia's dad contracted the Fishbone Gang to steal the Lifegem for him and Lorenzo found out and called in the goons (and/or B.Dahlia)
Well Filia even gets groped by Riccardo who, as we know, is a Medici goon, so that means she either looks a lot different or she wasn't that important in the first place. :P
OR they are keeping her dissaperance a secret as that information leaking out could really hurt Medicis.
OR they themselves have something to do with her current state.
Samson cannot use the Skulkheart as he isn't a woman (do parasites have gender? I guess so...) but that leaves the question of how he's going to convince Filia to wish him anything at all.