Well Lynnlee's allergy results came back. The doctor tested for cashews, peanuts, pecans, almonds, plus out door allergies. They aren't able to test for bee stings though. Everything came back negative so we assume that it was a bee sting. Apparently Lynnlee's pain tolerance is amazing after heart surgery because she didn't even flinch if there was an apparent bee sting.
So I'm glad to know now but it is scary at the same time because she loves playing outside. Luckily I have an Epi pen that I keep with her at all times. Hopefully I am at her side the next time she gets stung. Marshall's Great Uncle died of a bee sting so I guess the allergy runs in the family.