I am missing many cards so I must preface this opinion with admitted ignorance. First I'm not so sure that the Queen is truly dead. We have completed the story and raids yet no mention of a funeral or mourning ceremony for any important Reef characters. You would think if a queen and prince were killed there would be some sort of mention either through tower comms or cutscenes. Second, Eris is definitely a guardian and in collusion with the queen (per grimoire card). To what end I don't know. I agree with the podcast that she is on the good side, but she is most definitely shady. Between races ,factions, classes, and even some fallen loyal to the Queen. the "good" category can get a bit blurry.