She was always painted as the "villain" in the group during their three year hiatus which I always found amusing since Cheryl was the one prancing around trying to crack the states and generally being a fame whore.
Good for Nadine for speaking out and setting the record straight.
I believe she went to the States originally to be with her boyfriend at the time and pursue business interests.
With all the negative press she got here I don't blame her for being wary about putting herself back in the spotlight here, especially with Cheryl's high profile. Both the press and some of Cheryl's most staunch fans ('soldiers') seem to take pleasure in perpetuating a Nadine v Cheryl 'feud'. Some appear to believe that if you like Cheryl you must dislike Nadine, and vice versa.