I would hope flight attendants would wash their hands and/or use hand sanitizer prior to serving food and beverages regardless.
Unfortunately airlines cannot guarantee an allergen-free environment. Service animals are permitted to travel without a kennel. Had there been one on your flight you wouldn't have much recourse. About all you can do is if aware that an animal we be on board is to request to be seated as far away as possible. The next time you travel with your daughter call the airline and make them aware of her allergies. Also call again 24 hours before your flight and ask if there are any pets traveling on your flight and if so request a seat as far away as possible.
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