“How can you make autism go away?”

Not really. Autism is essentially different brain development than in many other people. You cannot make it go away but you can teach your daughter to adopt and potentially use many special skills that autistic persons have.

Unfortunately, autism doesn't go away. Your daughter will benefit from therapy such as applied behavioral analysis or ABA therapy to help her learn some social skills. Many people with Autism are quite successful. You should look up Temple Grandin, who is a motivational speaker with autism.