[@Inner Demon]	

Why wouldn't she try to kill Beast: Same reason she wouldn't try to kill Deva. She views her success rate as laughable.

Why wouldn't she try to give a command: She already gave commands and they were ignored.

Why wouldn't she do science/experimentation: She IS going to be doing this. She's finding out how Beast succeeds or fails at stopping her suicides in different environments.

Why wouldn't she look for an off switch: Not a bad idea, but I don't think you'd like the implications of her finding one.

Why is suicide her go to plan: Weren't you one of the people who read the backlog? Miyu attempted suicide or detonated herself like twice a battle on average.

Why would Beast die before Miyu? Wouldn't he die at the same time or slightly after?