The main thing that I'm failing to understand in the belief you have is this:
Why was it part of God's plan for her to lie?
How can God get glory from a sin?
Why does He bless her because of the lie?
I know that you said that even though we sin, God still blesses us... but, I do not believe that God blesses us for our sin, He blesses us when we do His work, when we follow His Will, when He gets the glory.