C.W.
HFA/AS can be a very sticky widget when it comes to school accommodations. IEPs are designed to help students learn. When they're making great grades, it's nearly impossible to prove a deficit in their learning.
After 5 years of fighting in 2 states, my ds received a 504 plan and a Gifted IEP, but they were pretty worthless. We chose to homeschool and actually get his needs met.
As far as the diagnosis, schools are not legally permitted to make one. I would contact the nearest child development center (usually in university medical centers) and ask about their payment arrangements. Ds's full eval (with educational psychologists, developmental peds, occupational, physical, and speech therapists, and more) was billed at thousands and thousands of dollars, but I think we paid a total of $200-300 after insurance.
In the meantime, there's plenty to read up on that she can implement at home. There's no reason to just ignore it in the meantime.