My recommendation would be a far cheaper solution.
There is series of very cheap books by Peter Robson (buy books 1-5 + answerbook) £2.95 each where you should go through books 1 & 2 thoroughly, book 3 half way and parts of books 4 & 5.
These old fashioned books are excellent. They give four worked examples and over one hundred practice questions.
They cover all 27 topics listed on this website that you will need for eleven plus exams and helped my son get into QE boys.
Once you have covered sufficient practice questions for each topic your daughter will find the exam not that challenging!
27 maths topics:
http://www.elevenplusexams.co.uk/revisi ... _maths.php
Peter Robson books:
http://www.elevenplusexams.co.uk/books/ ... p?g=f&p=10
The books are a bit cheaper on this website.
I am sure that is all you will need to ace the maths.