@Sh4dey But it is amazing... something about blood has strong reactions with different people. For some it makes them feel aware of death and emboldens them while others feel aversion and anxiety with a vast range in between. Personally I am disgusted by even my own so I don't like looking at it injuries, but at the same time feeling it on my hands or face makes me feel stronger even though as I am injured I should feel weaker. I cannot be the only one.
She was a naturally spawned high demon. As in she appeared fully formed from thin air.
Also it wasn't stated in the manga for reasons, but she is technically 12 years old. Technically because spawned demons are born already knowing a ton of stuff. As in right after spawning she knew how to walk, talk, and kick ass.