Yeah, I mean, if we had more info on when the workers were there it would really be helpful. But if this K guy who talked to her didn't do something to her, then something happened to her after that, and likely somewhere else. And we're only dealing with a two hour time frame here (an hour of which her family was searching the neighborhood), so to me, if whoever was at the house when she came by didn't do it, then it would seem like it almost had to have happened somewhere else.
I can't see someone taking the risk of dragging her all over the neighborhood, back to the house, etc. I think she was well secured within wherever this occurred by the time they started searching at 4pm - probably long before that since the sibs were out looking.