Sounds like she's worried. I understand that concern, but it's not the end of the world.
My brother has ESRF and has been on dialysis for 10 years. My mother has MSD and her kidney function has been 26% for many years.
Lupus makes my legs and feet swell too. (I take two Lasix a day)
Try not to fret too much that just brings on stress. Stress makes us feel worst.
One of our moderators had Lupus Nephritis and she can discuss question better than me. Hopefully she can come on here soon.
Lupus, Fibromyalgia, Glaucoma, Asthma, Hypothyriodism, Sleep Apnea, OA, Depression, Allergies, and benign familia tremors
When life throws you lemons....
Pick them up and throw them right back at them! :))