60 avalon knights can handle her.
If man manage to have gift of health active and not panagea so gorgon has no additonal hp she can quickly die against mulitple good units. Or maybe just units with good att and damage with good res lots of AP and blessed with an astral bless plus anti magic spell affecting whole battlefied. Should deal with the situation too. Problem is, she has always a good chance to escape as flyer.
I played a Gorgon yesterday and a friend just had 20 avalon knights and like 100 longbows attacked with single gorgon and dominionI in that province(positive for me) she killed all avalon knights and she managed to fly away with just 1hp left, surprisingly she was even wounded with air shield, mistform, invulneriblity, mirror image, personal regeneration up, and longbowmen did the damage not avalon knights, they quickly died, however in another testgame 60 of them could kill her. Probably anything with good stats and magic res and flying can kill her too.