Tears of Rejoice

Gwyn was always the black sheep of the family and basically raised by the Malfoy's and the Weasley's. Her parents could care less about their youngest child. Gwyn lied to her friends about her family and what they're like and how they truly are. Once her secret is out, can Harry and others trust her again our will the mark on her arm seal her fate? (During HBP - DH)