New here. Waiting for diagnosis

Hi im new here . My daughter is currently a year into a 2 year waiting list for a assessment . Shes been seen by paediatrician and sen in school waiting for next step . Im struggling to understand her and feel like im failing her . Shes 11 and cant sleep a full night in her own bed but cant explain why.. she starts high school in sept and im really scared .. anyone got any advice please