T.F.
I would be talking to my pedi about this because you never know if the next reaction will be a severe reaction that would deem it necessary to call 911 if she is not breathing, throat swells, etc.
Certainly get tested because you may need access to an Epi-pen or benedryl quickly. I'd want to know so I could avoid the food causing a reaction.
A lot of children are allergic strawberries. My daughter broke in hives so I never gave her another one. Then one day when she was older... 4 or so.. she started eating strawberries with no reaction and loves them to this day.