Fibrosis of the lungs - expectations ?

Hi, my mother was diagnosed 5 months ago with Fibrosis of the Lungs. She is taking drugs to combat swelling but her underlying condition seems to be deteriating. I have been with her to her consultant but it is difficult to ask awkward questions without my mother getting upset. I would like to be aware of what the future holds. It would help with care etc.
On a daily basis my mother is taking 40mg of Prednisolone along with 600mg of Natecal and 3 x 600mg of Acetylcysteine and her condition is reasonably stable. We are advised this condition is probably linked to her Arthritis.
I would assumme her breathing will become more difficult with time. There is another drug she is likely to take that is not a steriod, she awaits the results of a blood test.
Whats the outlook like. I may not like what I hear but need to know how long we may have left together and the likely quality of life my mother may have.
Many thanks for any information.