phenomen a book

This is a story of Shiro, a 12 year old girl who wished to adventure around the world. Only to end up in an untimely death. When she wakes up, she finds herself in what seems to be a new world, and her body has changed to that of a catkin. Using her knowledge from knowing literature of people in similar situations and adventuring, she tries to make a place for herself in this new world. Only to find out that reality is far crueler than one would imagine. Even with what one would call an OP unique skill and other OP advantages, she finds things quickly fall apart regardless how hard she tries. Thus she seeks more and more power to not only survive, but to protect what is important to her.