New to autism

Hi I'm new to this site and was hoping to get some information to help understand more about autism and learning disabilities in my 13 year old granddaughter.

We have fought for years to find out what is wrong with her to be told over and over again she has emotional issues and is quiet and doesn't mix.

We went private and got told in minutes that she has autism and learning disabilities she will never be independent  it is a big shock and I have been doing lots of research as she will be coming into my care.i have concerns as she is wanting to become a boy she is fixated on the idea.i think what I'd like to know is when these children get fixated in there teens can they get aggressive and does anyone have any ideas on how to handle this