Because Humans are imprisoned on sight. Android is not going to be able to defend against a whole island alone. She also lights up in the dark, so she can't be sneaky. She wouldn't have been able to set foot on the island, just like MC. You would also be handing an Android to the enemy to dissect.
Story writers typically have a direction they want to go, and a story they want to tell, and not all day to create filler content that doesn't actually mean anything. I either want her to realize the truth, or not. I, as the story writer, already know what's going to happen since this is a linear story. I can put in as many paths to those points as I want, but it becomes wasteful filler content if it doesn't mean anything. This is why I did it the way I did. There's just no story reason for a "half truth" or a "grey" when I already know what's going to come after it. The player doesn't though, so I understand why you would want more options. Life isn't pre determined like stories.
I also am not going to create new story paths for each different half truth you tell her, like I said, I already know what's going to happen, so I have a different perspective.
