This is something that will need to be diagnosed in order to treat it. There are many things that can cause chronic diarrhea and blood in the stool.
Some examples are parasites, worms, abnormal bacteria, metabolic disease, food allergies, inflammatory bowel disease, and growths in the gastrointestinal tract.
So, if I were the vet I would start with a fecal test. First I would check for worms and then I would check for coccida and giardia as well as abnormal bacteria. All of those can be treated with prescription medications. Those would be the most common problems we see.
If the fecal test was normal I would run blood work to see if she has metabolic disease.
If that was normal next I would take abdominal x-rays to see if there is anything in the abdomen that should not be there.
I think you will find something with those tests that you can treat.
Until you can get her to a vet, I would feed her a bland diet of plain cooked ground beef rinsed of fat mixed with plain cooked rice or pasta.
The blood is from severe inflammation and irritation in the lining of the intestines. If there is more than a teaspoon of blood in one stool, or her gums turn pale with blood loss, then she needs to see a vet right away.
Does that help?