What I tell every parent with concerns is, have your child assessed. There is no reason not to and it could be the first step in her recieving services that help her in areas that she finds to be challenging. That being said, if she's having some difficulties, it's a good idea to seek her some help with those particular issues, diagnosis or not. Autism-spectrum diagnoses are behavioral and there's always subjectivity in the decision making. The bottom line is, if your daughter could use help, make sure she gets it.
My gosh..she sounds alot like my son..and he was just diagnosed with Asperger's last week. I would seek another opinion..you know your kid better than anybody!