Jamie heard about a divorce that was printed in the rag mag, which she does not believe is very reliable. however, over time, she forgot where she heard about the divorce. the fact that she forgot the origin of this information (and the fact that it was not reliable) is known as

the sleeper eftect

Explanation:

When someone is initially not persuaded by the given message at first but over time they begin to get persuaded by the message , the delayed persuasion effect on someone is known as the sleeper effect.

Usually this occurs because a person don't really trust the source where the persuasion information comes from may be the reason they take time before they can believe the message .

This can be seen when politician try to convince or persuade people to vote for their parties it takes time for most people to actual be persuaded by their message.