There is a clear contradiction between what she says and what she does.

contradiction 是由前缀 contra-（表示"反对、相反"）和词根 dict（表示"说"）加上名词后缀 -ion 组成的。contra- 和 dict 组合的字面意思是"说相反的话"，所以 contradiction 的意思是"矛盾、对立"。