The third book in the Seventh Dimension Series, The Castle, A Young Adult Fantasy, is now available at online bookstores.
I am currently reading it. Am over half way through and can't wait to see what happens next.
This sounds like something my daughter would enjoy!
the Kindle version of Seventh Dimension - The Door is free today(Thursday, Feb 21) on Amazon. Click on the Kindle icon on the left side of the page to order.