Who created medusa?

Theory 1

Medusa was a beatiful mortal that poseidon fell in love with. Her sisters helped her and Poseidon sneak into Athena's temple to make out . When Athena found out, she went into a rage. Not beingable to punish Poseidon, she punished Medusa and her sisters by making them absolutely hideous for the rest of eternity.

theory 2

Medusa asked Athena for something and she wouldn't give it to her. So Medusa said she was prettier than Athena. Athena knew that the mortal needed punishment, and she soon found out that Medusa had to gorgon half sisters, so she made Medusa a gorgon as well.