It doesn't, it gives you a temporary boost of ego, not true self confidence from your--and here is the clue--self, which is the only unconditional self esteem worthy of anybody's pursuit. The kind you can only get from being happy with yourself, not changing yourself and getting confidence because you're different and suddenly shallow people appreciate you. That kind of confidence is attention dependent, unreliable and frankly a bit unhealthy. I know this because I have been there - grown into myself and been found attractive only to find that the "confidence" my similar-minded friends and I got from suddenly being pretty to others was short-lived, needy and false. The mind is internal. With a bit of work, she can appreciate herself truly and get more happiness from instilling that than any constant adaptation to being superficially, stereotypically attractive can give her. And please don't repeat yourself that counseling doesn't work, because I highly doubt your experience is illustrative of counseling overall. Like with everything worth doing, it takes a lot of time, new attempts and work - and I know that's not easy in a suicidal/deeply unhappy mind (again, I have been there and I never thought I would ever get even the little bit better I have so far), but I find it frankly offensive that you are implying that counseling is ineffective at enabling people to get over their hurt, overcome suicidal feelings and become stronger while plastic surgery is suddenly an acceptable solution with acceptable morals to be sending out to kids. You are essentially saying "working at changing what's in your mind won't work, but having surgery on your ugly face so people find you attractive will", and I don't even know where to begin with such a ridiculous sentiment.
If we gave our kids true confidence from day one rather than enabling others to tell people how they should look to be "pretty" I don't think quite as many kids would be feeling suicidal about their appearance and being bullied for it in the first place, frankly. Any girl, boy or person at all anywhere deserves to be taught to appreciate themselves without changing their appearance to gain approval, become what others would subjectively call beautiful or to get bullies off their backs and an ego boost from resulting superficial approval.
Suicide as a result of low self esteem an other painful feelings happens, yes, but it is not unavoidable. Nobody said getting better, wanting to live on and loving yourself was or is easy. I am only just starting out on that road at eighteen years of age myself, and that is much earlier than many. But I sure as heck won't sell myself short by changing what's outside for an ego boost/others' approval when I can work at it and change my mind, giving me confidence no loss of looks or lack of approval can take away. When you make your confidence and perception of yourself as attractive extrinsic, you cheat yourself out of unconditional self appreciation and give yourself so much less than you deserve. I can't see how that is acceptable for anyone, much less a fourteen year old girl getting surgery before she's even grown into her own face to "fix" things other bitter, shallow people subjectively said were bad.