Esophageal Cancer Life Expectancy

A family member, age 90, has been diagnosed with Stage IV Squamos Cell Esophageal Cancer.  Her esophagus is completely blocked by tumor in the C2/C3 area and there is metasis in her lung and lymph nodes.  She is maintaining her weight by way of a gastric tube thus far and is up and about a good bit of the time.  The tumor failed to respond to radiation and she is in hospice receiving palliative care.  What should we expect in terms of life expectancy, progression of the disease and outlook as far as suffering?