Hi hun. I haven't read all the replies, but I wanted to send you
I went through a really tough time with my DD1 when she was 6. She was assessed for ODD, but as she was behaving at school she didn't have it.
She is still a very defiant child & I am still having a really really hard time with her most of the time, but I think (hope) it'll get better. (She moved out the other day!! )
There is a huge scale of autism, so I'd let them look more into that. JIC. It can be very mild.
The only advice I can give you is try to keep calm & take each day as it comes.