I am a writer full time, this is what I do. It is my passion and freelancer is just one avenue that I explore it on. I am also a proficient editor who has completed work at +500 pages. As a linguist and a children's book author I believe I have both the technical skill and the creativity that is required of this job.
In fact this job mirrors one of my most common writing exercises whereby I will find a short story, edit it, and try to double it without changing the context of the piece. Given this I believe that I am the ideal candidate for this job. I am also waiting for my work to return from an illustrator right now, so I can get your project done skillfully by the end of the day if that is preferable to you. Otherwise I am comfortable completing it on any time line you prefer.