Newly diagnosed daughter in law to be

Our daughter's girlfriend (25 yrs old) is recently diagnosed with high functioning autism and is at a loss as to where to go from here!  She is currently unable to work and is keen to become independent, but she suffers from overwhelm/exhaustion in social situations and is often unable to participate or attend mental health appointments/telephone calls due to general anxiety.  Our daughter is desperate to help her and we are seeking any advice on where to go from here.  Thanks very much in advance.