What are key symptoms of Traumatic Stress Syndrome in children, and can they be confused with autism?

My partner and I just adopted a 9 yr old little girl and she has been through it all in her short life. She has been with us since Jan and we have noticed severe learning and communicative disabilities both in school and at home. I have been doing alot of research, and at first believed that she is mildly autistic. That was when she was still having regular contact with her biological family. Now that she has had no contact with them for about a month, sometimes she will function as a somewhat normal child, and we have periods where she can carry on a normal conversation. She still spends most of her time doing repettitive things like tracing or drawing the same shape over and over, and repeating what we say. I was just wanting to know if sometimes TSS could mimic autism, and since our CW isnt being very helpful in getting her tested, im a little on my own, and we are worried about our little girl. Im clueless about what to do, and we are about to pull out our hair.