Canon be damned, that "now" version of her sounds far more interesting and entertaining than the "she was" version!2) The Raven Queen was not an interloper in the cycle of death. She did not interfere with it. She was the primary guardian of it. The god of death she killed and replaced was an evil god of necromancy, while she was a neutral deity of death, fate, and winter, more akin to real world deities like The Morrigan or various psychopomps. Now she messes with death in an almost parasitic way, stealing interesting souls and making them play out their tragedies for her entertainment.