Welcome to WP!! !
I can tell you that you have taken the first step in the right direct, by wanting to help her. That will help her in the long run and make life a little better for her. Second, you need to let her be herself so don't limite her in what she can and can't do. She will do that. Also, just be willing to be there for her, let her cry and talk to you because that will help her cope and know that you are there for her. This is what my mom did for me. She pushed me to do things like order my food at restaurant or asking for help at a store, which I hated but it helped me in the long run. However, she allowed me to do things I wanted to do which helped me find what I could do or handle and what I couldn't do or handle. One last thing, let her know that having AS is positive thing and it will help her.