This is what jumped out at me, too, in that "didn't I read somewhere" way. Do you have any research (the shorter the better) to pass along to the teacher about the connection between adoption and certain maladaptive behaviors? If the teacher can understand the circumstance, maybe you and she can brainstorm ways to address it with your daughter.
And, barring that, tell the teacher to ditch the candy, for Pete's sake! Candy is not a required resource! :cursing: