That's too bad she doesn't like her boobs even though you think they're great. Some women just aren't happy with how they look, and want to look a certain way because they think that people will like them more. Or they think that they will like themselves more. (The old self-esteem argument-which is BS because self-esteem comes from liking yourself no matter what).
I can see getting them done if it's for your job...like if you are an actress, or a swimsuit model, or even in bodybuilding if you have like no bodyfat and all that's left is skin. If you are getting paid to look a certain way, well go ahead and knock yourself out.
But if you actually told her you don't like that, and she is getting it done anyway, I think that shows her to be a little bit insecure and vain.
But whatever, it's her body. But I think she should worry about what you think too. After all, you two are a team.
Why doesn't she spend the $10 000 or whatever it costs on something that makes you both happy? Or even just put it toward retirement? After all, when you're both 75, those boobs are going to be pretty well useless when they're surrounded by a whole lotta saggy skin and wrinkles.