Perhaps unsurprisingly, Universal have cancelled all Amy Winehouse's upcoming US dates, including the MTV Awards:
"in a continued effort to support Amy Winehouse's well-being".
The "continued" is an interesting aspect of the statement, but let's be charitable and assume they've been working wonderfully behind the scenes. After all, most record companies are incapable of taking care of their healthy artists, so there's no reason to assume they've just been rubbish at helping out an unhealthy one.
And let's be even more generous and believe the cancellation of these dates really are to "support" her well-being and not merely bowing to the inevitable non-appearance.