Perfection is a relative term. It does not mean the same result across the board. For example you might have a utensil that is perfect for the job it was made to do, but would be useless for something else. The animals were made "perfect" but still probably died. But they were perfect for animals. Humans and spirit creatures were made perfect, but not in the same sense as God. God is the one who decides what perfection actually means for all his created works.
With Eve, it is actually LOVE that would have made her choose the right thing, not "perfection". It is love, or lack of, that would make her decide what choice she made. Obviously perfect humans were made with that flexibility; to love or not to love.
The only being that is perfect to the ultimate degree is God. This can be as hard to understand as no beginning and no end.