Hello and thank you for your question.
When I was 13 years old, I too was interested in reading books relating to science and engineering. At that age, what helped sustain my interest on these topics was participating in "hands on" projects. I would recommend that you visit this site: http://www.carnegielibrary.org/teens/stem/showbooklist.cfm?catid=6&list=STEM_sciencefair
I like the fact that this site have many different books on scientific projects; ones that you can work on at home. This will help your daughter be engaged, while expanding her knowledge on scientific principals. Also, this site have fun books on a multitude of science subjects (i.e Anatomy, Chemistry, Biology, etc).
I've also included a link for you, as a parent (http://theinstitute.ieee.org/career-and-education/preuniversity-education/online-magazine-to-spark-engineering-interest-in-teens). This is an Online Magazine to Spark Engineering Interests in Teens. The site is a great tool to help you help her, on her journey to become an Engineer.
I hope this helps.