Although it may feel like starting over, you may want to change doctors. You need someone - or a team- to look at her comprehensively (school, home, behavior, learning etc.) so that you can make sure her life is as structured toward her needs as possible. Then, bring in the meds. Meds alone are not going to help - but they are an important piece of some children's treatment plan.
You may already be doing this but just didn't say it in your post. Without knowing what specific areas she is struggling with and where you would like to see improvement, it is difficult to offer specific advice. I would only say that if switching to different meds isn't helping, than the meds aren't the issue - it's something in her home or school environment that you need to experiment with.
I have a 10th grader who was diagnosed in 2nd grade. It took me about 3 years before I understood her needs and got a working program in place. She is on Adderall XR (can't remember how many others we tried) but she also has the structure in place so the meds don't have to do all the work. Now we are in the process of transistioning out of being the one "in charge" and allowing her more control of it - wow, is that ever gratifying and nerve wracking at the same time :)!
Good luck to you!