She was nick named "The Lady with the Lamp" From when she would care for the soldiers during the Crimean War when she would carry a lamp during the night in order to see.
Florence Nightingale's nickname was the Lady with the lamp. She was called this by the soldiers because she used to walk around at night seeing to them carrying a lamp.
Florence Nightingale's nickname was 'The lady with the lamp' because at night, in the hospitals it was dark and they had no electricity, so she walked around with a lantern.