反问句 意思是:是

Means absolutely YES.

según el contexto

Maybe you should put this sentence in a specific context for it might express different meanings in different contexts. For example A: 她真漂亮 B: 哪里不是呢？ In this context it uses a rhetorical question tone to indicate a positive meaning which actually means"是的，她是很漂亮yes， she is really beautiful".