Can Someone Explain This Food Aversion/Habit?

[PB&J]

Over the years, I’ve cared for toddlers who will put ANYTHING and EVERYTHING in their mouths....except food! Maybe about four kids.
They will...

I have a 10 month old who will not try any food that is not in purée form. I've tried offering a huge variety of foods and textures. She gags when anything...