When twelve-year-long vegetarian Amanda Kelso decided to eat meat again, she went whole hog, eating meals consisting of pork throughout the month of November. Serious Eats talks to her about her methods and motivations.
http://www.seriouseats.com/2007/03/30-days-of-pork.html (http://www.seriouseats.com/2007/03/30-days-of-pork.html)
Omnivore's dilemma, eh? I'll have to read a copy... Somehow though I don't think it'll change my mind. Somehow it seems like saying stuff like, "I'm already $20,000 in debt, what's another $1000?" or, "I'm already 300lbs overweight, what's another twinkie gonna do to me?'.
Also, she may have been rebelling against her ex-boyfriend. That seems likely to me.