In Euripides' Ion, we find the following lines in a dialogue between Ion and his mother Creusa (Perseus Digital Library text in parallel with Coleridge's translation):
Κρέουσα: ἴστω Γοργοφόνα —
Creusa: Be witness she who slew the Gorgon,
Ἴων: τί τοῦτ᾽ ἔλεξας;
Ion: What meanest thou?
Κρέουσα: ἃ σκοπέλοις ἐπ᾽ ἐμοῖς / τὸν ἐλαιοφυῆ πάγον / θάσσει —
Creusa: She that on my native rocks makes the olive-clad hill her seat.
I'm with Ion: what (or who) does Creusa mean? Not Perseus, usually credited as the Gorgon's slayer, but wouldn't be called "she". Is it Athena, who bore the Gorgon's head on the Aegis, who's associated with olive trees, and who plays a significant role in Ion? (Or as an unlikely possibility, Perseus's daughter Gorgophone, whose name means "Gorgon-slayer"?)
Does this reference some version of the Gorgon myth in which Perseus wasn't the slayer? Perhaps even a version where the Gorgon wasn't identified with Medusa?