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Perhaps you meant that she is _really_ well articulated (rather than rarely)?

No, I meant _rarely_ as in it is rare to find a person so well articulated in their argument.

I took it as she is articulate only on occasion.

it was a rarely well articulated appraisal

'Unusually' better captures the meaning you intend. Both words denote roughly the same, but they differ a great deal in their connotations.