Okay, I don't know really anything about food allergies as we don't have any. I was extremely and still am careful about what DS eats and potental food allergies. But here is my thought/advice and you can take it with a grain of salt or for whatever you want. I have found some babies are picky about textures, I bought (silly me) banana baby food and ds would not eat a real banana after that because of the texture. So maybe that is what she doesn't like.
Have you ever tried a fresh food feeder or a safe feeder?
You could put whatever food you want, say pees and she could chew on it herself. If she wants it she can help herself and if she doesn't you aren't forcing her!
I used one like this for cherries! It was also great for freezing yogurt in and letting ds chew on it while teething! <--- I even put a ice cube in it for teething purposes
and there is no choking problems, although I would never leave a baby alone with it.