OP, I suggest you look into Phonographix or Abecedarian. They both have relatively inexpensive materials for parents to use at home if that is the approach you wish to take.
If your child cannot yet decode I would not worry about comprehension.
Abecedarian website is here:
http://www.abcdrp.com
You would probably want to start her on Level A Short version. There is a workbook, storybooks, and a free blending practice for Level A that you can download here:
http://www.abcdrp.com/docs/ABCD_WABS_02.pdf
Also I recommend that you get the book "Reading Reflex" that explains the basic method behind Phonographix and Abecedarian in great detail. It will help you to understand what's been going on with your child.