Can it be stated any clearer? "The only sister who could match one of the Forsaken was in Ebou Dar. Moghedien could have killed Egwene without anyone noticing."

There. Egwene says the only sister who can match Moghedien is in Ebou Dar. Now, unless you are saying Egwene is in Ebou Dar while thinking this, this settles the debate. Egwene herself has settled it. In the context of that sentence, the next one is even more explicit. She has already said she cannot match Moghedien. Now she goes on to say Moghedien could kill her without anyone noticing. What more do you want?

Must she say "I cannot hope to match Moghedien's strength?" Oh wait, she's already said that!

As for the Lelaine, Romanda and Egwene quote. For Pete's sake, she is talking about them matcing the male Forsaken that freed Moghedien. Not about them matching the two together.

She and Aviendha combined cannot even match Lanfear. And Egwene plus Aviendha is already stronger than Egwene plus Lelaine plus Romanda.

I cannot believe you are even trying to twist this passage in the way you just did. The passage is as clear as it can possibly be.