Lupus often attacks kidneys and causes fluid problems that can be severe. Lasix treats the symptoms which is increased fluid retention and prednisone is attempting to treat the cause which might be lupus. I had the same problems and gained 20-30 lbs of fluid in a few days several times. Once lupus was brought under control my kidney function returned to normal. However, I take an ace inhibitor and a diuretic and will probably do so the rest of my life. No big deal and everything is under control now.
Good thing you acted quickly and hope your mother's docs can figure out the right treatment for whatever is causing these problems. I have been in remission for 8 years and live a relatively healthy and active life.
MCTD (SLE Lupus, polymyositis, scleroderma). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, barretts esophagus, quadriplegic in 2005. Recovered and now active in downhill skiing, golf, hiking. Meds: amlodipine, benezapril, omeprazole, potassium, folic acid, vitamins, maxide.
Remain Optimistic and you can overcome.