You guys need to consult a private dog trainer. Sometimes they can be expensive, but the relief that you’ll feel afterwards will be worth the money spent. And you could even bring up the fact that you’re under a lot of financial stress, and the dog is making it worse and interfering with your day to day lives as well, so he needs to pay for her to go to a professional trainer, and you both attend sessions. You could potentially do some research on doggy day cares that do training as well.