。
She is wise rather than merely clever.
Literal
She [topic-は] clever called [rather than-というより] rather wise is.
というよりむしろ ('rather than X, more like Y') refines a description — she's not just 利口 (clever, sharp) but 賢明 (wise, prudent). 利口 implies quick-wittedness; 賢明 implies deeper judgment. である is the formal copula.