I personally don't agree with getting a boob job, but that doesn't mean I'm going to tell everyone around me not to do it and that it's wrong. Besides, even if I did, every person will do as he/she pleases. I believe that each person should feel good about him/herself regardless of how he/she looks, but I suppose I can only say that because I don't have a huge/glaring flaw (and if I do I don't see it lol). But I've seen a lot of kids I grew up with it, and it always made me a bit sad that we all have to go through school in a fairly hostile enviroment. But I think if you notice something really bad about yourself and it bothers you and depresses you, go ahead and change it. If it bothers you THAT MUCH.. then change it and start feeling better about yourself.
However I think it's wrong for a senior to be getting a boob job as a graduation present. I think a laptop would be much more appropriate as a graduation gift. She's still growing and changing, not to mention the way we think changes drastically from 18 to 21, what if she doesn't want it later? I know you can always get them removed, but why not wait a little bit longer until your thinking is a bit more mature? (no offense to anyone)
My friend had D's throughout high school and although she had a wonderful personality, very few of the guys who wanted to hook up with her wanted to for her personality. She would always be upset that they would "look down not up at me" but I never had this problem. Granted I didn't attract as much attention as she did, and I was slightly jealous, but now I feel a bit sorry for her (especially since she still has this problem).
I agree with the proportion thing though. I have no hips but I have a pretty big butt for an asian, but my boobs are A cups. And I don't mind that they're small but I notice that my body is not proportional and it tugs at my mind, but oh well. I'm too scared to do it haha.