I think that she's "stuck" in her old look, as many of us can be. The sad thing is that she has her own cosmetics company, and is probably wearing her own stuff! It's not necessarily the best advertisement.
Maybe we can just think of her look as being a little "retro"... Sort-of "beach girl".
Okay, well I gave it a shot!
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"It is our choices that show what we truly are, far more than our abilities"
(Dumbledore to Harry Potter)