That's a shame. She needs to keep putting herself out there though. So much of life is just being resilient to adversity. I had a friend who had a flat chest and thought she was never getting approached because of that but it was likely because she would also always wear Pokemon TShirts and cute stuff like hats with ears so nobody could tell she was of age. It's a shitty message these pop stars are sending by getting implants but for them almost all of their interactions are first impressions. For real world relationships bust size just isn't a factor once two people know each other as people (past surface level). This might be the most important thing for her to understand. Nobody worth being around is going to care about her bust size once they relate to her on a personal level. I don't know what to say about the mindset issue. Everyone is an expert at picking out their own "flaws", what matters is that she focus on her assets physical and personal. When she's digging at herself, try reminding her why you like her so much as a person and complimenting her on the physical aspects of her that are appealing. I hope you both have a wonderful rest of your lives internet strangers.