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"My questions was, why didn't the author become a U.S. citizen?"Her personal motivations and desires really have no bearing on her legal status here. Questions like these imply that the only people the US can accept into its borders are:
1) Citizens
2) Non-citizen short term visitors
3) Non-citizens committed to obtaining citizenship
Yet, historically, many of our most valued and productive members of society have been immigrants who did not obtain citizenship right away (not to mention the labrynthine and expensive process required to get just a green card today [1])
> "A person who has no intent on citizenship is not a immigrant, should their visa expire, they are simply an illegal alien outstaying their welcome"
The issue is not legality, but proportionality. If you forget to renew your drivers license and drive with it expired, you will get a ticket. You then pay your fine, renew your license, and in the few days this process takes, you are inconvenienced by not being able to drive. At no time have you "outstayed your welcome on the road" and no sensible person will accuse you of "thinking it's acceptable to drive without a license". Sensible people recognize an honest mistake in a byzantine system and give people the benefit of the doubt.
On the other hand, if your visa status is in any way imperfect for a single minute you can be deported and barred from ever reentering the country. The OP was "lucky" to be allowed to be able to reenter 18 months later. Welcome to the land of the free.
[1] http://immigrationroad.com/green-card/immigration-flowchart-...