New diagnosis HELP>>>>>>

Hi, Our daughter has just been diagnosed finally with Autism and ADHD. She is 6 years old and has just started spitting and screaming along with her meltdowns. We are not getting any help or advice from our Paediatrician or GP so I thought I would ask anyone for some tips. She has help at school through her SENCO and O/T. We have tried counting with her to 10 and doing the breathing exercises but as she does not know she is doing anything wrong this is very hit and miss.