What is the meaning of Granny?

A grandmother.

Any elderly woman, regardless of if she has grandchildren.

A granny knot.

An older ewe that may lure a lamb away from its mother.

typically or stereotypically old-fashioned, especially in clothing and accessories worn by or associated with elderly women.

To be a grandmother. (Can we add an example for this sense?)

To act like a stereotypical grandmother; to fuss.

A grand final.

Source: wiktionary.org