@sirgalahad So sorry to hear about your friend. Cease or severely reduce sodium intake. Exercise to keep muscles with blood flow and reduce swelling, besides the movement will actually make you feel better. Coffee can act as a natural diuretic. Homeopathic remedies for aches and pains can include belladonna, which I have used before. Overall caution as to diet, not overdoing salt/sugar/protein all seem to help me. Having a circle of friends to support you is so important, as she knows by having you!
I hope she feels better soon, and that this helps a little.
Ginger