Eve's sinless nature at birth is certainly offset by her participation in the first sinful act, and her sinful nature thereafter. How then would she, in her fallen state, be blessed at all? More to the point she was cursed, and all her progeny.
Compare that to being selected to be the mother of the savior of the world, to be the vessel bringing forth salvation, and an end to the very curse laid upon Adam and Eve. It certainly does not take very much to be higher on the 'blessed' scale than Eve.
Was Eve being created without sin a blessing?
Is it better to be with sin than without sin?
It's ridiculous to even ask the question, yet that is what your arguments imply.
God created Eve out of nothing, in a perfectly sinless state. How is that not a blessing?