potty training on leash and outside the yard

Question
I have a six month old airedale who is very well house trained however will
not go to the bathroom, not even pee if it is not in her backyard or my
parents backyard. I read the advise on how to get a dog to pee on leash the
problem is she will pee on leash if she is in my backyard but will seriously
hold it forever anywhere else. I have to take her back to the breeder in a
couple of weeks (just to board for a few days while I am out of town) and I am
really concerned about her. Like other places she has visited the yard is
completly fenced and she has run of it she just will not go and she doesn't
seem to be growing out of this 'stage fright' sort of fear.

Answer
Well she can't hold it in forever,if she stays someplace long enough she will eventually go,some dogs can even take as long as two or three days(dogs can actually hold it in alot longer then people)But they will go,because they will have to-this is rather common,and there really isn't alot you can do,but it might make it easier if she stays the night sometime someplace else because it will get her used to being someplace else,therefore it won't bother her and she'll just go