Does anyone know why this happens? Is it a glitch? I've built a settlement at Kingsport Lighthouse, and invited one of my settlers from Sanctuary to live there. Things were going fine for a while, but then I left one time and came back and she was gone. Vanished like a fart in the wind. I don't think she was killed or kidnapped, as I received no notification that either an attack or kidnapping had occurred. Though, come to think of it, it was just the two of us besides Dog and the brewery robot so I guess if she was kidnapped there would be no one to tell me about it, as I don't believe kidnapping missions pop up automatically. Who knows. Maybe she just got lonely and took off. On a side note, I once spotted this particular settler back at Sanctuary, yet I had not sent her there. It seems she has a flighty personality. She came back to the Lighthouse that time, but this go around its been days and days and she's still absent. My Pip-Boy says 0 settlers at Kingsport, so I suppose she's gone for good.
I'll miss her.