Was Paradise already Lost?

In Book IX of Paradise Lost, Eve and Adam are having a discussion about whether or not Eve should go off on her own to do work. Adam believes that it would be far to dangerous for Eve to go off considering that they have been warned about the threat of Satan on Earth. Eve then beings up a very interesting point.

"If this be our condition, thus to dwell
In narrow circuit strait'n'd by a Foe,
Subtle of violent, we not endu'd
Single with like defence, wherever met,
How are we happy, still in fear of harm?" (9. 322-26)

In this passage, Eve points out that they are already not living the same blissful life they once were simply because they now must watch out for Satan within their Paradise.
This passage leads me to speculate if Milton was trying to make it seem as though Adam and Eve's fall was not so traumatic after all, and that because of Satan's threat, Paradise never had a chance of staying blissful forever. Or maybe, Milton was trying to point out that Eve may have had more reason than Adam after all.

Sheryl W.