I am not into kidnapping/abducting/holding ppl hostage, but if I was-based on the shows I've watched and books I've read (documentaries, not fiction), I don't think I would have them around me while I had conversations with others, said names or anything specific they could later use, let them see me, etc...if I had a slight thought of "releasing" them. I guess unless there was enough fear in them where I felt trusted them to be around me. Obviously I cannot think like the captures , but I would take a leap and say they may not have even been in the same location/room/building/whatever as her the whole 3 weeks, since we do not know that information. Maybe they picked her up, put her somewhere, visited her for whatever reasons, and then now she's back (cliffnotes version). Just one scenario as there could be many.
*As I wrote that, I thought back to the "shows/movies" I watched as a kid. You know the "scary movies" that were about crazy people that weren't true. Now I feel whenever I watch shows or read books, I have to think to myself that there are people out there really storing people in containers, abducting them off the streets, people disappearing, etc. Bah! And to think how many more are probably doing it right now!!