Originally Posted by Endgame
Did you miss the part where she works for Kaze'aze and is the boss of Ellia Continent?
Did you miss the part where that wasn't Elena and it was Kamiki being the impostor of Elena? Though the in-game storyline doesn't go into details, you can find the in depth storyline somewhere in the Korean Grand Chase site.
Besides, there's a fixed rate when upgrading. If you want someone to blame, blame the developers. Elena is just an NPC forced to use those fixed ratings.