My fiance is mother just got diagnosed with scleroderma and we just wanted to know how long can people live with this? And what treatments did they receive?

Scleroderma has no known cure — there is no treatment to stop the overproduction of collagen. Your doctor may recommend a number of medications to make it easier for u to live with scleroderma by treating its symptoms. Your doctor may also suggest medications to prevent complications of scleroderma that may affect various organs. Here r some of the many treatments prescribed for the symptoms & complications of this condition.
read more:

http://mayoclinic.com/health/scleroderma/DS00362/DSECTION=treatments-and-drugs

It can be fatal, depending upon the type. There are 2 types of scleroderma, an auto-immune disease that literally means ''hard skin''. The milder form only attacks the skin, the epidermis, causing hard hands and feet. The hands and feet become very sensitive to cold ad painful. The more extreme form attacks the inner organs and leads to death.