Goddess of war

"I will let myself die instead," Cleopatra answered promptly as Kuso had stated so. It had led her to froze into silence... 

Thus, Cleopatra continued with her words as she said,

It was a reason why if I were you. Then I will choose to kill myself instead.

Cause...

Albedo had loved you a lot since you were a kid. I mean, in a romantic way. But, she knew that you were a kid. So that's why she changed that love into a will to taking care of you. Like... she had breastfed you, taught you as if you were her son. And continue until you were big enough. But... she was not brave enough to reveal her feelings as if that you will deem her as a weirdo. But, she was devoted to you a lot as if you are someone who she won't leave over.

Thus, this is why that she will prefer to kill herself than letting you use her full authority. Just let me tell you the reason why Anna wants to dispose of Albedo so much.