After watching the last bit of this cutscene multiple times, I think Eris Morn might be evil... but that's just my opinion. It might be Bungie's lack of story, or maybe they're going to go more in-depth about it in Destiny 5, or just stuff it somewhere in the Grimoire because they're too lazy to make more cutscenes, or something. Anyways, tell me what you think. I honestly think she's trying to help the Queen pursue her potentially evil goals.