Great question — answering as the UphillTech team:
It is difficult to be sure what will work without knowing more about the specific allergies in question, but there a few things you might check, if they may not trigger her allergy. Orange flower water, also called orange blossom water, is one possibility - this will certainly be orange themed. You might also look at orange blossom honey, which again gets the flavor from orange blossoms. Since these are made with the flowers, rather than the fruit, it may avoid whatever is specifically triggering the allergy - on the other hand, since it is the product of the same tree (usually the bitter orange tree), it may contain the trigger anyway. You might also look at other citrus fruit, if the...
Full answer by Megha: https://cooking.stackexchange.com/a/75030 (CC BY-SA 3.0).
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