She refuses to pee or poo outside of her own yard

My two oldest were like that as youngsters.  They would do their thing anyplace, EXCEPT when we stopped for them to pee on a trip.  The campground, no problem, but on the road??  Forget it.  And it was simply a matter of out waiting them.  I've heard a match stick in the rectum will help with the poop problem.

I honestly don't know for sure, but some of the folks that show should be able to help.  I think it's a wooden match stick used a bit like a suppository.

One thing that might help is to use a longer lead so that she can feel that she has a bit of privacy

 Bugsy is still a dog that is reluctant to go elsewhere (other than his yard) although he has gotten better about peeing he can still hold off pooping for insane amounts of time.

The way I look at it now is that he will go when he just can't hold on anymore.  When we travel he often won't poop for a couple of days - to the point he can't/won't eat - but he goes eventually.  (and he is much better than he used to be at nearly 5)

The longer line is a good idea and also bringing some soiled grass/earth/mulch/ whatever with you might help.  put it down where you want her to go and her own scent might help.  I would try to train a command to go as well - that has helped us but we did that from day 1.

I wouldn't do the matchstick thing unless she hadn't gone (poop) for more than 3 days.  But that is me not any scientific info.  I just know my guy has gone that long several times

good luck

Hi, I hope you don't mind me responding to your posting.  I am a NYS Certified Dog Behaviorist/Trainer.   Please do not use the match stick advice - very dangerous!   My suggestions to you are to first keep track of her normal eating times, poop times, pee times, etc.  Much like we do when housebreaking a puppy. Make a daily schedule sheet so you can accurately pinpoint everything.  Start now by taking her on a "bathroom" walk outside of her comfort zone.     The more you get to know her digestion system the better you will be able to pinpoint the time she really has to go.   I have had people say that they take their puppy out every half hour but she only goes sometimes - the answer is that she goes when she has to. 

If you arent seeing results in a day or so on the walks,  take a piece of poop or a dab of pee on a paper towel and place it outside of your home to get her started.  You can even take the same from the other dog.  sounds gross but I have done this on many occasions and have been successful.    Make this as much a part of your daily routine as showering, brushing your teeth, etc is to you.    If you are consistent with this then you can teach her to go elsewhere.   Also, even though the day of the move is going to be stressful and emotional for you, it will be for her as well.  Take her (and the other dog) for a long, calm walk before putting them in the car - this will help tremendously, please make the time for this.  Also, as you take your driving breaks make sure to walk them for about 10-15 minutes if you can and remember to keep track of her bathroom schedule. Another very important thing, before you go into your new home with the dogs walk them for at least 30 minutes.   When you take them inside keep them on leash, do not let them go exploring through the house by themselves.  For the first week keep them confined to one room if possible and gradually introduce them to each room.   Change can effect a dog as much as it can us.  I had a case where a couple moved to a new home and the previously well balanced dog began biting (really biting) everyone that came into the home, including the owners.  The dog wasn't properly "introduced" into the new home and was very frightened by the new situation.

I wish you the best of luck on this endeavor and hope my advice helps!