Board Thread:Episode Discussion/@comment-14138255-20171107165310/@comment-26018514-20171115011130

MajoraSolaris wrote: That would be pretty funny but I doubt it will be something stupid like that. Maybe shes legitely mute. Its possible but it would be very disappointing if she was. She probably is... she has already outlived her intended existence in the show, and has had a VA since... I think it was "Breach"(V2).

She may be coming back, but it will be either a B-story part, as a minion for another big bad, or in some independent capacity that lacks relevance to the main plot. There is no reason she would have kept in contact with Cinder.