I would say "convince her to tell her parents the truth." That form of peer pressure is indeed a form of positive peer pressure since her friend would be pressuring her to the truth.
Explanation:
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Irony- Definition:
<em>a state of affairs or an event that seems deliberately contrary to what one expects and is often amusing as a result.</em>
Verbal: communication with words, which may be done orally through speech or physically through sign language
Nonverbal: communication that does not involve words
Interpersonal: any type of communication, verbal or nonverbal, between two or more people
Group: communication between groups of people or within a group of people