No, she's a cyborg actually. They said something about how she was a regular girl and went full cyborg at age 6.

And I must say, first time it happened, I was surprised. Next shot of her, and I said to myself, "Hey, it's Japanese. They don't really care." Then the third shot, I thought it was pretty hot. Then after that, it was pretty much, "ARE YOU KIDDING ME?"

I think she had to take the clothes off to activate the cloak but so many people on an anime message board disagreed. But then again, what DO forum people know? XD