The only time I would suggest a reduction for any woman if their breast size is large is for health reasons, pain (From personal experience being married to 2 women with large boobs) or if the boobs are inhibiting exercise or for sports.
Keeping that in mind her reason is for being unfairly judged by others and she wants this behavior by others to end.
Finally, it's her body and only she can make the decision to get a reduction or to keep those breasts of heavenly admiration.