4 year old girl with delayed milestones (speech) and convulsions, what can we do?

I have a 4 years old child (Girl) with delayed milestones (speech) and have been having convulsions when she has an infection. She is sometimes hyperactive she has been diagnosed to have mild autism.Currently we give her Tegrotol for convulsions. what can we do to help her catch up with her speech and to reduce hyperactivity and also to eliminate convulsions.