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I am sorry to learn about your daughter's situation.
While you do not have recourse for compensation against the school district for not pushing your daughter into special education earlier, you can use the IEP process to help her get assistance (such as tutoring, study aids, additional testing time, modifications, or other assistance) to help her get her studies back on track and ensure she is getting a "Free and Appropriate Education" (this is the standard that the IEP will work towards).
The IEP process will allow you to give input into the way your daughter learns, as well as input into the specific goals for her IEP. If you are unhappy with the IEP process or meetings, you have a right to have a representative there (it does not need to be an attorney, but you can hire a special education attorney if you like, some parents prefer to hire a special education specialist or their child's psychiatrist or medical provider).