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Is she quite the impressive person?
Literal
She [topic-は] considerable [genitive-な] person [question-か][right?-ね]?
相当な人物 ('a substantial / considerable person of significance') uses 相当 in its na-adjective sense ('considerable, substantial'). 人物 ('person, character') is more weighty than 人, with overtones of 'figure / personage / character of substance.' The sentence-final かね combines question か with reflective ね — a slightly old-fashioned, masculine-flavored phrasing for a hesitant or ruminative question. The whole sentence reads as someone wondering aloud whether the woman in question is really a person of standing.