There is also an excellent article about getting appropriate accommodations on LD Online. Type in GED in the search box to get more information. You can also get information about advocacy groups in your community through LD Online.
A traditional GED course may not be geared to students with learning disabilities (although many people in the class may have them). Passing the test may not be the primary issue here -- having someone work with your daughter directly on improving her reading skills may be. There are several excellent programs available for the older student with reading difficulties. Two of the best are the Wilson Reading System and Starting Over by Joan Knight (for more information go to the website for the International Multisensory Structured Language Education Council).