If you feel something is not right have her tested. There are programs such as Volunteers of America(free) or take her to a developmental pediatrician. It doesn't hurt to have her tested and if there is nothing wrong your fears have been eliminated and if there is early intervention is the way to go. Just remember the Autism spectrum is very wide and includes lots of different levels of Autism at many different levels.   I listed 2 websites for you to checkout baby center has a lot of good info on milestones but remember kids do develop differently. I hope this was helpful.

With having a 14 yr.old parapelegic at home from being crushed by a semi, a 9 year-old with Autism, Communication Disorder, and Sensory Dysfunction, and my 4 Graduate level courses I probably shouldn't be taking the time to answer this question....but it really jumped off the page at me and I hope it gets to you.

My son was only four months old and I knew something wasn't right (he screamed bloody murder every time I tried to pick him up). Now, given my background in education and the study of child development helped, but I didn't want to blurt out like some insane mother that my four month old baby had Autism.  So I waited until he started to show more signs.  Isaac, his name, by the time he could sit (6 mo) was throwing himself onto the ground banging his head, going into tantrums, wouldn't let me hold him, had food aversions, wasn't vocalizing, all signs pointing to Autism.  My advice to you, in a quick manner, is to get him to an Autism Center (I took Isaac at 18 months to The University of Chicago).  It was so worth it.  Don't mistrust your judgment about your child. If you think something is wrong....something probably is but that doesn't mean that you cannot step in and provide EARLY INTERVENTION FOR THAT CHILD! Please if anything do this.  It will make a world of difference for that child in his/her future.  My email is supermomsabrina@yahoo.com if you want to chat more later.  God bless.