A. Weight loss and loss of appetite is a major concern. I would strongly recommend to take her to your veterinarian for a check up and more investigation to identify the underlying cause. Several gastrointestinal diseases can cause those signs (from inflammatory or infectious gastroenteritis to even a foreign body ingestion).
If she is not eating much I am not surprised that she is not passing much feces (the intestine may take a while to process the feces). A foreign body ingestion is a possibility so I would recommend to take her to your veterinarian.
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