Just instead of methodically attempting to disarm this ship (IIRC the one swarm missile with aspect lock is better with this since they can't be shot down), just somehow survive till you can call in the reinforcements and then just call in all the heavy bombers you can to her underside, these guys will delete the corvette in a moment's notice.
This was the very first thing I tried and they got killed disturbingly quick, even when I sent in interceptors first to break up her fighter screen. I'll try again later.
EDIT: Tried it there, did as you suggested and went way below Medea. Durgas slapped her about and took her down! Thanks for the advice! I had to dance with those bloody Perseus all the live long day though, they seemed to do their job really really well.