How old is your daughter? Is she in pre-school or school? If she is, then it is likely that her teachers will have noted some differences themselves, so it may pay to ask them and list what they are.
From my experience of a psych assessment for diagnosis, if you go in suggesting that it could be AS, then the psych will ask you a lot of the associated questions anyway. Or even if you don't mention AS, they will still ask a whole range of questions that should bring issues up.
One thing I found with the assessment was that my son performed so perfectly in the hospital setting that they said "no" to an AS diagnosis. After a few months of further frustrations I asked them to come and observe him at school, and within two hours they diagnosed AS. As far as I am concerned, this happened because AS is ultimately a social disability, and so I feel quite strongly that an assessment needs to include this element, unless it is obvious anyway.