We cannot accept the conclusion that WW is faster than Superman because she said he was "faster than Clark," and "fast as me." Here's why:
Amazo had all of the League's powers, including the strength of WW and Superman, which is why he was stronger than both of them put together, i.e., WW + Superman + rest of League > WW or Superman. Given this truth, logic requires that we impute the same conclusion concerning Amazo's strength to his speed. And, once we've done that, we are forced to admit that Amazo is faster than both Superman AND WW. If that's true, and we know it is because (i) Amazo has the combined powers of all the league and (ii) WW would otherwise have been able to tag him, then WW's statement that Amazo is "fast as me" is false insofar as it suggests that she's as fast as Amazo. And if she's not as fast as Amazo, which we have established as true because she's not as strong as Amazo, then the statement that Amazo is faster than Superman also applies to her. Thus, there's no way to determine whether she is, in fact, faster than Superman based on her statement.