Granddaughter

Hi I have just joined the forum and hoping that I can get some help. My granddaughter has been diagnosed with Autism she is now 8 years of age. I am finding it very hard as we are getting conflicting information on how to cope with her. She is very articulate and her speech is brilliant. She relates well with adults rather than her peers. She has had lots of trouble at school hitting out when she has had a melt down. She had been excluded from school on many occasions we are getting more help now though form the education and they are starting to put more things in place. I am confused though on how to handle these melt downs and to identify what is naughtier ( I know you are not to use that word) and which is her condition. Any advice would be helpful. As a grandmother I want to do the right thing.