Oh, Ellie, the poor little puppy dog.
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Don't know if they sell them in the U.S. but I was watching a show here called The New Inventors and they had this petloo (loo = toilet) contraption. It looked really good actually but it was topped with artificial grass so it might not be something your dog would go for right now with everything else going on as well. They do have information on the net, but am not sure I should post it as it's to commercial site. Dogs can be trained very easily to use them... just using praise mainly and routine/habit signals. I was very impressed with the whole thing.

I'm not sure about what you mean with her looking fat. Is she bloated, like with wind or her bladder? If she's drinking heaps and still peeing heaps then that is a good sign... unless she had something wrong with her kidneys to begin with. If she's looking fat and eating less, it certainly could be bloating from wind or from constipation.

Let us know how she's doing.