J.W.
Hi M.,
check out http://www.sensory-processing-disorder.com/picky-eaters.html
and
http://www.altonweb.com/cs/downsyndrome/index.htm?page=fi...
and
http://www.pdppress.com/MORE.htm
She may be tactile defensive on her tongue-"orally defensive"--certain textures do not feel good, and in fact feel very unpleasant. This may take some desensitizing, and the same if she has a hyperactive gag reflex. An occupational therapist and/or speech pathologist that specializes in oral-motor problems can help you through this. Great idea to talk to the pediatrician, and some (like therapists) are more savvy and more experienced than others.
If I were you, I would call your local school district's Birth to 3 Special Education program and speak with an OT or Speech Pathologist. You could also ask your pediatrician for a referral to the above private clinicians and see if your insurance will cover the cost of an evaluation, and treatment if needed.
The good thing about speaking with a Special Education teacher in a Birth to 3 program about your child, is that you could network with other parents. Good luck! jenifer