She's into full metal alchemist, soul eater etc
What else might she like?
She's 15 and relatively sensitive. I am aware that not all manga is suitable for younger readers which makes it difficult to choose. At 15 she probably wants something more adult but some of these books have a fair amount of sexual violence which she wouldn't like.
I watched Death note anime with her last night which was rated 12 and my face was 
at the rating. The books are defined as adult and flicking through, it was pretty disturbing. Saying that, i was actively seeking disturbing when i was a teen .
Also any presents surrounding the genre?