Here's the exact quote:

Perhaps Nynaeve could come close, if she was angry enough, but Egwene knew she herself could never have done what he just had, split her flows that many ways, worked that many things at once.

The utter ignorance of Egwene at this point is prominently on display here. She says she will never be able to split her flows so many ways. Yet, to date, she has split her flows the most number of ways, that too while under the influence of forkroot (proving that strength has nothing to do with this, as Egwene seems to think is the case here).

To take this wild speculation of hers that Nynaeve maybe able to match Rand to mean anything is nothing short of a desperate attempt to validate a theory that became obsolete a long time ago.