What is life expectancy with life scleroderma?

My partner was diagnosed 10 years ago with lung scleroderma and stage 3 rheumatoid arthritis. She now has secondary pulmonary hypertension. She walks alot, uses her oxygen and is a non smoker. She has more shortness of breath and is more fatigued. No leg swelling. She is a retired ER nurse and thinks her life expectancy has now been reduced to 2-5 years. What do you think? Her doctors are not sure what to think anymore as she has outlived what they thought she would.