Has she been evaluated recently by Early Intervention and/or a developmental peditrician or neuro? If not, call for the EI eval and have them come out. She sounds like she would qualify for PT, OT and ST. If she does end up with a ASD diagnosis, the EARLIER you start working with her, the faster she will progress and there is less chance for regression. My son was diagnosed at 3 and I think he would be farther if we had not "wait to see" as our peditrician recommended.
Just in case, if you don't know how to contact EI, call your local elementary.