Have you asked the doctor if it could be a sensory feeding issue? This has to do with children who are extraordinarily sensitve to food textures. I am not a doctor but what you describe sounds very close. They might do an evaluation and send her to an occupational therapist. Here are some symptoms of this disorder:
Signs Of Oral Input Dysfunction:
1. Hypersensitivity To Oral Input (Oral Defensiveness):
__ picky eater, often with extreme food preferences; i.e., limited repertoire of foods, picky about brands, resistive to trying new foods or restaurants, and may not eat at other people's houses)
__ may only eat "soft" or pureed foods past 24 months of age
__ may gag with textured foods
__ has difficulty with sucking, chewing, and swallowing; may choke or have a fear of choking
__ resists/refuses/extremely fearful of going to the dentist or having dental work done
__ may only eat hot or cold foods
__ refuses to lick envelopes, stamps, or stickers because of their taste
__ dislikes or complains about toothpaste and mouthwash
__ avoids seasoned, spicy, sweet, sour or salty foods; prefers bland foods
I hope this helps!