Definately agree with Trillian, I would be having her evaluated at 2 if she hasn't progressed. Also you need to trust your insincts. With Jackson I was concerned he was a little different at around 18months and had him evaluated a few times, MCHN basically told me I was being ridiculous and that all of his behaviour (including hand flapping and walking on his toes!!) was completely normal for his age?!?!? As his mother I knew something was not right and had appointment after appointment with various professionals until finally someone bothered to listen to me and dig a bit deeper and then he was diagnosed with High Functioning Autism which has recently been re-diagnosed to Aspergers.