Metis was Athena's biological mother. Her current mother is Hera. She is a maiden, though got tricked into turning herself into a fly and giving birth to Athena. No one really knew that Metis was Athena's mother, but Pheme told Medusa and her sisters that news, and they mocked Athena by doing an "F-L-Y" cheer.
Metis can be a bit annoying at times. She tends to nag Zeus, and that behavior has been carried out on Arachne's tapestry, which Athena got very mad at.
She looks like a miniature person in the myth as well, and is predicted to look like a fly.