My thoughts on the release, were that they were too harsh. In the beginning of the Giver Jonas sees a jet fly overhead, and then sees it land, everybody is then told that the pilot will be released, If you don't know what the release is, it is a injection that instantly kills you. Thanks - DK
Because she doesn't want to do the assignment and she doesn't want her past uncovered which is why Anagnos says, "Annie. I wrote them no word of your history."