She sings well.

In a good or satisfactory manner.
He did well on the test.
They work well together.
The food tastes well.
well done
well known
well being
adequately
satisfactorily
properly
She sings well.

In a manner that is satisfactory or good.
He plays soccer well.
They did well on the test.
The cake turned out well.
well done
well known
well behaved
adequately
satisfactorily
effectively
She sings very well.

In a good or satisfactory way.
He plays soccer well.
The cake tastes well.
They performed well in the competition.
well done
well known
well received
satisfactorily
adequately
effectively