I think it's all a matter of proportion, and she has the ideal balance for her long, lean body. I also think that if she chose to get implants, she'd know not to go overboard. She can't lose, in my book.
Well in a few years she's going to retire and put on five pounds immediately, and then Mod's concerns will be eliminated. You will see the human female perfection you seek. Only thing is, will you be gorgeous enough to qualify for such a paragon of female beauty yourselves?