What to do with a dog you end up not liking

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The story is - over a year ago, my mother-in-law calls me up and says she is at the shelter with my husband and I have every right to say no, BUT, there is this puppy that MUST come out of this shelter. Being an animal lover and a good obedient daughter-in-law, I said to her 'well, I'll come take a look at the dog'. At the time, I was looking for a new dog to add to our home. I felt pressured, but, felt obligated. She really liked this dog and it seemed like if I couldn't take care of it, she would. In reality, she wanted it, but, knew she was unable to take the dog in. Anyway--- I adopted the dog, $350 later (ouch, and not fixed on top of that!!!). A few months later, she was hit by a car in front of my entire family - kids and all! My sister-in-law and I rushed the dog to the Emer. Vets office and dropped another $600. Then I had to transport her 100 miles away to have her shattered pelvis repaired. That was another $3,000 that my sister-in-law (who lives with my mother-in-law) helped split the cost. Otherwise the vet would keep the dog and put her down after a certain period of time. Now, a year later, we really don't like this dog. she's a pain in the but. She keeps escaping our yard, abuses our german shepherd. Nips at anyone who gets close to her bad leg, scares off kids, digs in the garbage, I have to treat her for exposure to lyme because she keeps going in to the fields, pees on the rugs, eats the cats poop, and a million other annoying things. Bottom line.... the dog does not fit in with our family. What would you do? Take her back to the shelter? Drop her off at the in-laws? Own up to our responsibility (do you give your kids up because you don't like how they behave???) WWYD?