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Hello. I'm sorry to hear about your dog.
I don't think this is just stress related. My guess would be that she has some degree of IBD (inflammatory bowel disease). This can be auto-immune or food allergy related. I'm sure they tried a hypoallergenic diet. If that didn't work, then it's likely auto-immune. To treat, we use steroids (Prednisone). This, along with Tylan or Metronidazole will typically clear it up.
If the diarrhea is not clearing up with Pred and Metronidazole, then I would start to worry about a mass in the abdomen. A colo-rectal tumor or small intestinal tumor can be the cause. These can be tough to diagnose. They don't always show up on x-rays or ultrasound. Most are diagnosed at the time of surgery. That is an option for you if you want answers. Treatment with surgery and chemo can then sometimes get these guys back to a good quality of life. It's not curative, but it can help.
I hope this helps, let me know if you have any other questions.
If she's been on the meds and the signs still persist, then I would do an exploratory surgery to get biopsies. That's the best way to finally get an answer and then some targeted treatment vs a shotgun approach.