Dosent like school

My daughter has just turned 4 i had to attend pre school with her for 8 mths as she was very anxious and has seperation anxiety.  I started leaving her just before christmas it was going ok she would cry a bit when i left she dosent play happily with other children and needs guidance.  Last two weeks she has become extremely anxious about going to school crying and breaking down. She dosent like eating her lunch at school and says its noisy. Last thursday she became anxious and upset this went on for over 3hrs. Hv adviced to keep her home until Monday. A meeting has been set up with senco ect for acfew weeks time. She has already been refered for autistic referra. It makes me sad to see her so unhappy and anxious at school . Has anyone else experienced this and any ideas how i can help her . Many thanks.