Well, that's depressing. Her boobs are great. I think her only "issue" is that, specifically when behind her dress, they don't form a cleavage because they are not (as) close to each other. However, her boobs are basically perfect when she has no clothes on. The risk here is that surgery is no joke. Sure it can go well... but there's ALWAYS that % of probability that something goes real fucking wrong. Also I don't think plastic will solve this... this seems to be a very much structural/genetics thing.
She just happens to be ~90% perfect in almost every way but doesn't have this very, very small thing perfect. It's her choice or whatever but to me, as a guy, seems like a very small thing. I guess the guy equivalent would be having a 9" inch dick with 6" girth but it has a slight curve? hah. Good luck to her though, hopefully it goes well...