I'm doing the Bloodline quest, and when I was walking to the boat, Serena disappeared. I've checked everywhere we've gone, and did everything I used to do to get back a lost follower, such as waiting for a few hours and fast-traveling somewhere else. No one else will follow me because she's still a follower. I'm on Xbox One, so I can't find a way to load my save before losing her because I don't know when she got lost and it only shows my four most recent saves. I can't add mods to help because my Xbox has no internet right now. I can't think of anything else that I could do, can someone please help?