My daughter is close to the same age. We are having the same problem. In fact, I spoke to her dietician yesterday. She told me that if I’m going to introduce new foods, they probably need to be bland. I have also bought items off the internet, and know they are expensive. This last time I tried things like, bread and cheese for grilled cheese sandwiches, or frozen chocolate chip cookie dough, or pasta. My daughter has tried the grilled cheese sandwich. We make one and cut it up in to about 4 pieces, giving her one piece at a meal. She will take a bite, but hardly ever eats the whole thing. You might try oven bake french fries. Hope this is somewhat helpful.