At what point do you say enough? Personally, knowing her attitude, I would never have allowed her to assess my DD's reading. My advice (if you really want to continue to be friends with her) is to make your DD's abilities off limits. You don't need her approval and you have taken the extra step of evaluation from experts... there really is no need to try to convince her of anything. You know what your daughter is capable of and if she rolls her eyes at it all ... really her own problem.
This said ... I do have concerns for you and what you are up against if your friend is any indication of the attitude in your local educational area. I'm crossing my fingers that you find a great environment for your daughter. She sounds wonderful.
Big hugs for you ... I really don't know why you put up with your friend. We all have had one of those and I finally accepted that I needed to cut ties, even if she was one of my closest friends before having my daughter. I just don't need to waste my energy on negativity. I need all the energy I have for keeping up with my DD.