I would say, no. Perhaps if you looked at it as an algebraic equation, you could say both clauses give the same information. A = C = B is the same equation as B = C = A, where "C" is the idea or substance of what she says and means. But meaning and saying are two different verbs and describe two different processes. So even on the denotative level, the sentence is not redundant.
On the connotative level the difference is even greater. Someone who "says what she means" is often considered outspoken, or impolite. Someone who "means what she says" is often thought of as prepared to back up her words with actions.
Each expression is an idiom in its own right. A person who does one, does not necessarily do the other.