In the kitchen, Sister stirs hot chocolate mix and water in a metal pan that covers two burners. Sister receives living expenses from her religious order, based in Omaha, Neb., so she doesn't charge for her work or mileage. Once the president or chief administrator of Mercy hospitals in both Davenport and Chicago, Sister Ludmilla now finds herself tagged the Mother Teresa of Davenport. When others see this, several decide that they, too, could use some new shoes, so Sister soon gets other requests. Adds Lisa Pence, 43, of Davenport: "Sister makes you feel whole.