Both cannot be right. Either she must doubt the One and believe the other, or she must believe the One and doubt the other. How long it took Eve to make her choice we do not know. The choice is made. The curse has fallen.
Death is inevitable.
She has chosen to disbelieve God and to believe Satan, to doubt the only wholly trustworthy being in all the universe and to put faith in the one who is least trustworthy. Nothing could be worse than this. All other acts of sin of which the human race is guilty are as nothing compared to the sin of unbelief. Failure to believe God in anything is the greatest of all sins. It severs every tie that binds us to God.