Oh gosh if you did that you would never get anywhere, BUT at her age, she should have already had fruits, cereals, vegetables, by them self, right?
Did she react to rice cereal, oatmeal or multigrain or wheat cereal? Did she react to banana's?
As far as the oil goes and I assume egg would be in it, You could test egg by itself, but not really the oil.
Has she had any processed snack type foods.
If she has not really reacted to foods in the past, I would not worry so much. If you do get a reaction though, you will have to go through the ingredient list and determine what could have been the cause through trail and error.
Let us know how she does, Wendy