Dear Thomas,
Your concerns revolve around two areas: communication and social-emotional development.
It is clear that your daughter's development of speech and language is not what you would expect for her age. Seek an evaluation by a Speech/Language specialist, who can help pinpoint with some precision the areas in which your daughter is deficient, and develop a plan to address them.
On the social/emotional front, there are indicvations of problems, particularly in relation to the lack of reciprocal social relationships. However, I wouldn't assume yet a condition along the Pervasive Developmental Disorder spectrum. What is called for is a developmental evaluation, and be sure to include a child psychiatrist on the team. A developmental pediatrician and/or developmental psychologist should be on the team as well.