If a perp took her, I would have to believe that 1) He/she would have a car parked very close by and 2)He/she would not take off her clothes while abducting her.
So this walking and baby in diaper doesn't make much sense to me if it is related.
FWIW, I had a colicky little bub and would take him outside at all hours of the night because it was the ONLY thing that soothed him. I am gonna hope perhaps this is what it was.
What were the temps last night?
It's been kinda chilly at night here, can't imagine having a baby outside in a diaper.