Hmmm.. an interest of mine, but not of my kids, alas, so I don't have ready suggestions for books.

FWIW, I did a quick google, and without reviewing the sites in detail, here's a couple I would expect to at least have appropriate and reliable info:

http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel_pre_2011/genes/dnarev3.shtml

http://learn.genetics.utah.edu

http://www.pbslearningmedia.org/resource/tdc02.sci.life.gen.lp_hgpwhat/the-human-genome-project/

http://www.discoveryeducation.com/teachers/free-lesson-plans/the-human-genome-project.cfm

http://www.pbs.org/wgbh/nova/body/cracking-the-code-of-life.html (Note - I love Nova, but would pre-screen for a 6-year old!)

As for dragon genomics - oy is right! Perhaps after she tries some parts of the genetics primer, she might consider for herself what would need to go in to creating such a beast? Now there's a genetic engineering project! (this gecko with batwings photo may inspire: http://imgur.com/gallery/tT8lB1s)

Good luck!