Godmother (noun)

1. A woman who acts as a sponsor for a child at baptism.
2. A woman who acts as a mentor, protector or guide to someone, especially a young woman.

Origin:

Late middle english: from god + mother. the term was originally applied to the virgin mary and is used in the sense "godparent" in the 16th century.

Examples:

1. My godmother is my mother's best friend.
2. She was like a godmother to me, always offering advice and a listening ear.
3. Her godmother was the one who taught her how to cook.
4. The godmother of the child is responsible for its religious upbringing.
5. She's the godmother of our organization, the one who helped us get started.