For what its worth I've seen a similar reaction in some clones of a friend. They'd been transported in rather unfortunate conditions, left in a dark box in a car while its freezing. The majority of them, once brought inside, warmed up and put under lights, raised their leaves straight up and they stayed that way for a good couple of days. Not the same circumstances as yours but perhaps a similar reaction to stress ie the transplant. Could her roots have got damaged at all during re-potting? Strange that its just the one plant.