Just curious where Serana goes when I dismiss her. Will she return to Fort Dawnguard, since I am part of the Dawnguard? Or will she go to Castle Volkihar (or the dock that takes you there)? I'd like to know where to look for her should i choose to dismiss her.

I play the Dawnguard side and when i dismissed her she places herself in the middle room at the benches at the entrance in Fort Dawnguard.

Mkay, good to know. Was curious where she would go so I wouldn't have to scour Skyrim for her.