She has very strong opinions and she's not afraid to speak her mind.

speak 的意思是"说、讲话"，这里指表达观点。 her 是代词 she 的所有格形式，意思是"她的"。 mind 本义是"头脑、思想"，引申为"想法、意见"。 speak her mind 是一个固定短语，意思是"直言不讳、说出心里话"，指毫无保留地表达自己的真实想法。