The fact that is the "best setting" locally doesn't mean that it is the right place for your DD, actually, I would go as far as aaying that it is often the case that schools in the more deprived areas are better prepared to deal with particular issues.
DS had a full diagnose by a very reputed educational psychologist, the assessment lasted more than 6 hours and the report was 18 pages long, yet the headteacher of his "very good" school refused to accept it saying that he would be rich if he had taken a pound for every dyslexia report he got and dismissed his disability as a "boy's thing they grow out off"
I remember her teacher filling the forms for the assesment, saying that DS was aloof, uncooperative and not particularly bright. I eventually moved him to another school, where they bothered to read the report and adapt things a bit to make it easier for DS to keep to task. He was classed as gifted and talented within 6 months.
Incidentally, people commented that DS' new school wouldn't be good considering his dyslexia and delays in writing, as there were many children there whose first language was not English. Incidentally, that meant the school had a lot of experience in bringing children up to speed, so DS managed to move up 5 sub levels in a single year.
BTW, the fact that her teacher has 20 years experience is not a proof that they should know everything. My mother was a headteacher for 20 years, and just retired after 40 years in service, yet she was the one that found it more difficult to accept that DN has autism, she really fought the diagnose toth and nail even when DN's autism is far from being mild.
Looking at DN, I remember a very similar boy in my class when I was at the school were she worked. She taught that boy for three years but always blamed his behaviour on the parents not paying attention to him. In her opinion, he couldn't talk and was so violent because he spend more time with the family dogs than his parents. WTF? 