I don't know the article or whatever you're talking about but I'd presume what she meant was that when Bon Jovi needs a violinist she's the one they come to, which in a sense does make her Bon Jovi's vioinist which is different from her saying she's a member of the band.
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These days the stars seem out of reach
But these days there ain't a ladder on these streets
These days are fast, love don't last in this graceless age
Even innocence has caught the midnight train
And there ain't nobody left but us these days
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