Nephrotic syndrome is due to renal failure and is manifested with finding proteins in the urine (proteinuria), decreased proteins in the blood (hypoproteinemia) and generalized swelling (edema).
There is no data that polio vaccine can cause renal failure.
It is very important to discover if her renal failure is chronic or acute. Chronic renal failure is usually an autoimmune disorder while acute renal failure can be due to various conditions (poisoning, infections, allergic reaction etc.).
You may want to consult a nephrologist about her condition.