How do I stop school from holding my child back in the eighth grade for the third time.

Repeating the second time in the eighth grade my child has been diagnosed with ptsd, school phobia, she is in counselling for anxiety attacks. She has been bullied and ostrasized by principal and counselers. They told her she was going to repeate the grade again and she just gave up and wouldn't go, She is suffering mental difficulties, was hospitalized for cutting. Now she is just depressed, and ashamed. She is smart and can do the work. She was getting good grades when she attended classes. They refused to offer her alternative education until they were threatened. Now they have turned her over to the child study team but as far as I know they still plan to make her repeat the 8th grade again. I told them I wanted her in 9th grade no matter how they had to do it. They have not offered her summer school. She and I both believe that she can do the 9th grade work. Thank you for your time