Hi Swoop
I too am no expert but i think each person reacts differently. With my friend's son who is allergic to bananas, she tried 3 times prior with no issues until the forth time he got hives all over his body and now whenever he eats a bit of bananas he gets hives straight away.

So it might take some time before any allergic reaction can be seen.

Good luck and hope you can get your DD allergy tested soon