Mara isn't evil so much as she is willing to do whatever it takes to see her will be done, including but not limited to manipulating people, causing a centuries long conflict from behind the scenes, make someone suffer for millennia the blame and guilt for making it so the awoken could die even though it was actually ...

How did Mara Sov die?

Mara allowed the War so the Awoken wouldn't feel comfortable in the Distributary and would be willing to leave it with her. Later, at a time when the power of the Queen in the Distributary was weaker, Sjur Eido swore to kill Mara Sov.

Who is Mara Sov's lover?

Sjur Eido was the first Queen's Wrath and Mara Sov's lover. She was killed during the Reef Wars, and succeeded as Queen's Wrath by Petra Venj.