Just seems she changed her mind, perhaps her and her new husband at the time truly didn't think she'd ever get back into modelling again. Given the physical problems she's mentioned her boobs causing her in recent years, it was probably to them a no-brainer for her to take a reduction...no matter how much the true blue big-boobs-or-nothing crew would've been saddened by it.
Now, a couple years or so down the line, she's had a change of heart and wants to give it another shot. So now she has two options...either get implants, or stick with what she's got. If the current size is not what it once was, I'd argue it's better than a fake pumped-up imitation of past perfection.
Don't think she'll get the same coverage and attention as before but she can still make good coin off her figure for a while yet, so hey-ho, best wishes.