Board Thread:Skyrim/@comment-108.71.57.69-20130609000611/@comment-6881629-20130717083209

Serana is terrible for getting stuck on terrain maybe she landed somewhere far away and is stuck on a rock. If this did happen you'd better reload a save if you can if your Separated from Serana when shes a normal follower (specially on 360) for any length of time she can vanish or lose follower options.