Melissa never had actual friends growing up, so her ideas of friendship had been formed by stories she'd read where best friends are the best of friends and betrayal was a sometimes thing that was clearly foreshadowed (in fiction) or just something that happened to someone else. So when Melissa made her first real friend, Miller, she thought that he'd always have her back, had no interest in harming her, and would always be true. She also thought that because she was right and telling the truth that fate would be on her side and it would all work out, so she risked everything.

I think she looks good with eye bags.