Hi there:
Hummm sounds like it deft. could be and wheat and corn are high allergen foods. Blueberries I don't think are that high allergenic, but causes problems here.
My rule of thumb is: If it causes sleep, mood, or gas problems, I take away the food.
Sometime though it is so hard to know because it could be teething or anything.
If she is sleeping good on nights these foods are not introduced, then I would say that she could have an allergy or more than likely a sensitivity.
Personally I would not even corn because it has very little nutrients in it anyhow, so you don't have to worry there.
The wheat though, gosh it is in everything. Good it be anything else in there she was reacting to?
My experience with blueberries have not been good. It caused lots of gas and night wakings. Or it could have been the apples... But we avoid both anyhow.
I think I would not give the actual corn anymore, maybe try another food with wheat in it and see how it goes. Not sure about the blueberries, I may would wait on them too.
It is so hard, because I feel like my lo's diet is so limited. No milk, apples, strawberries, oats, blueberries, nothing with any spices/flavor.. Gosh he lives on pears, squash and rice cereal it seems like.
I hope this helps some.
Hugs, Wendy