"Gallows humor" is how she tries to explain herself.
"Ms. Knox tries to explain some of the unusual behavior she displayed. In one highly publicized incident, after the body of Ms. Kercher was discovered, Ms. Knox stood outside the villa and repeatedly kissed Mr. Sollecito, drawing suspicion from the police. Watching the clip later, Ms. Knox said she remembered feeling young and scared, in need of comfort.
Later, people would say that our kisses were flirtatious evidence of our guilt, she wrote.
At the police station, while Ms. Kerchers British friends huddled together in grief, Ms. Knox wrote that she paced the hallways, dry-eyed, slamming the heel of her palm against her forehead in anger.
First I showed not enough emotion; then I showed too much, she wrote. Later,
a journal entry from that day, in which Ms. Knox wrote that she would really like to say that I could kill for a pizza but it just doesnt seem right, would make her appear even more suspicious. In the book, she dismissed it as gallows humor.
http://www.nytimes.com/2013/04/19/b...ic-court-of-approval.html?pagewanted=all&_r=0