I see. Basically when her bullshit tolerance reached its peak, she gets replaced by the old Melissa... probably...
and this old melissa can do a good job as long as the prince isn't around... is what I imagine :3
I think I get why he was killed as dk.
He probably saw a female for the 1st time and went:
"A girl!?? It has boobs!?? Impossible!!!"
and he died so lame he wanted to forget.