What are possible diagnoses for left side abdominal discomfort (near navel) and soft stools for 4+ weeks? occasional low fever, possibly unrelated.

A few things: Symptoms like this in a 47 yr old woman could be sign of inflammation such as a colitis, diverticulitis. This could be more benign such a sign of bowel irritability due to IBS (irritable bowel syndrome) or lactose intolerance etc. Also consider if you started any new medications or diet changes. Visit your primary doctor or obtain an appointment with a gastroenterologist for further evaluation.