A few days could have elapsed between her creation and them sinning
Then that makes the idea of it being a fair test even more laughable.
Of course, all this is moot for the simple fact that the Genesis account never says it was Satan who deceived Eve. It merely says "a serpent". That idea was inserted later by Christians with too much time on their hands and a wild imagination.
I'm not denying that Satan's words could be taken as implying that God is a liar...But JWs are quick to accuse him of lying due to what he implied
It is interesting that JWs will not apply this same standard to their beloved WT/GB as well. Think 1975, generation, etc...a whole lot of "implied"* comments about those subjects from WT.
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* implied = direct, dogmatic statements with god as their source later claimed to be only implications.