Okay great. Thanks for the additional information. I really appreciate it.
It sounds like we may need to use a little over-the-counter product to help take the edge off her anxiety to help her understand where she's supposed to go to the bathroom.
A couple things you could try would be:
Melantonin is an over-the-counter drug that can be used to treat some anxiety issues in dogs. The dose you would give would be up to 3 mg given orally whenever necessary up to every 8 hours. More information can be found here: http://www.petplace.com/drug-library/melatonin-melatonex/page1.aspx , which includes risks, warning signs to watch out for and other bits of useful information.
Try a DAP collar. These are collars that are impregnated with a man-made version of the dog appeasing pheromone, which is a pheromone that nursing bitches give off to their pups to help them feel calm and secure. It's something that humans can't smell, but it has an amazing effect on dogs with anxiety and other issues. Although you can find them at your vet's office..you can also find them online at places like Amazon.com and Ebay for much cheaper. Just make sure they're DAP brand, as they seem to work better than some other versions.
If you're unable to get her to understand with the use of products and the potty training, you may want to consider using a product like a potty patch so she has somewhere to go in the house that doesn't result in ruining your flooring or mess in her cage.
You can read more about it here: https://www.pottypatch.com/?refcode=1002&ot=tm&gclid=CKmX2uGP3sgCFcKGaQodeJ0BBg
I hope this helps.