score:2
O'Hare's website lists what is currently offered at the airport. And as you discovered there is no flower shop.
Between security rules, agricultural rules and traveler's shopping preferences, flower vendors are few and far between. Tropical destinations which are known for their flowers (Hawaii, Thailand, etc) may offer boxed cut flowers. But most airports offer the same same shopping experience worldwide (fashion, fragrance, alcohol).
The days of picking up a bouquet of flowers while flying for the mistress at your destination are pretty much gone.