Is an unmarried widow a mademoiselle?

The term "mademoiselle" traditionally refers to an unmarried woman in French. However, a widow is a woman whose spouse has died, making her no longer unmarried in the conventional sense. Therefore, while a widow may have been referred to as "mademoiselle" before her marriage, post-marriage she is generally referred to as "madame" regardless of her marital status after her spouse's death.