Bad husbandry can stunt a snakes growth, snakes grow for the whole of thier lives so changing to the right set up should grow a little more. A 30 gal is way small for a 5' snake he needs at least an enclosure big enough to strech out part way in. A 5' snake needs at least a 50 to 60 gal enclosure I understand that its only for a short time but don't prolong bad care. If you want her then you will need to be able to provide proper care when you get her. If the person will hold it till you get the right setup I would do that. But don't put her through 2 months of a little, cramped house that just not right. Good luck