Signs of autism and everyday life with an autistic child

My Daughter Emily was born 33 weeks and she is 3 years old, she goes to Speech Therapy four times in a week she still does not talk, she does eye contact when someone speaks to her, she understands everything that u say, i as her mom im worried because at these point kids at the age of 3 are talking she speaks a little bit, My Question is Is my Daughter Autistic and how can i help her please im Desperate...