Last year, Susan Patton, a Princeton grad and the mother of two sons at the elite college, outraged feminists when she wrote an open letter to the Daily Princetonian telling female students to find a husband on campus before they graduate.

The red alert — which argued that these Ivy League college girls “would never again be surrounded by this concentration of men who would be worthy of you” — went viral with more than 100 million hits.

Now Patton, an independent HR consultant who lives on Manhattan’s Upper East Side and who’s been dubbed “Princeton Mom,” has capitalized on her fame with an old-fashioned dating manual, “Marry Smart.” Published this week, the book argues that coeds have a limited shelf life “as young, beautiful [women who are] as attractive to men or as fertile” and advises them to spend three-quarters of their time in school on the hunt for Mr. Right.

But what happens if you missed your shot and didn’t get that all-important MRS certificate along with your liberal arts degree?

Nil desperandum, says Patton. She believes that, even in the dog-eat-dog dating jungle that is New York, there is hope for single career women between the ages of 22 and 35 (yes, that’s her cutoff) who also want marriage and babies.

“These women are spinsters-in-training, but they can turn it around,” says the 50-something divorcée. “They need to apply the same attitude and gumption that got them to New York City to the task of getting a husband.”

So listen up, unattached ladies! Here’s where Princeton Mom thinks you’re going wrong: