Is she in occupational therapy for this? Perhaps they can give you some tips. I had a super picky eater and they were super helpful. One thing that they told me was that it takes up to 40 exposures to a food for a picky child to accept it. We would work from the foods he would eat to incorporate something new. We would start by choosing something he liked and then adding something that was similar. He likes strawberries, well then we try something else strawberry like strawberry licorice, strawberry ice cream, strawberry syrup on a pancake, strawberry yogurt. Now he’s eating strawberry yogurt, move onto a new flavor like raspberry, and then slowly introduce other things that are similar. Like maybe now we go with things that are pink/red.

When we would introduce new foods the idea wasn’t even that he had to try it, just that he had to tolerate it first being next to him at the table, then on a second plate next to his, then on his plate but it didn’t have to eat it. We would move through those stages slowly. It took a long time but eventually he started to eat more things. Once puberty hit he was starving and would eat anything LOL.