Welcome to the forum! I'm so sorry your mom is having so many problems. Lupus is very difficult to diagnose (except with biopsy ... like kidney biopsy). Has she ever had a kidney biopsy??
The doctor to see would be a Rheumatologist who specializes in lupus. You can get a list of docs from your local Lupus Foundation Chapter (link in my signature).
There are also links in my sig to the Lupus Foundation website and one with diagnosing criterea. The Lupus Resources link has lots of help for new members . . . I would start by reading those.
Unfortunately diagnoses can be a rather drawn-out process . . . but a good rheumatologist will treat her symptoms while he is watching her progress, even if he can't make a definitive diagnosis.
I hope you find lots of info here.
In His Grip
AlwaysRosie "We can't control the waves, but we can learn how to surf!!"
Co-Moderator - Lupus Forum
UCTD, Inflammatory Arthritis, Diverticulosis, (recent dx - Sjogrens, Crohn’s 4/08)
Clickable Links: Lupus Resources Lupous.Org Lupus Criteria (4 of 11) Lupus Chapter Locator