It's actually interview with her husband:
http://www.gloria.com.hr/intervju/showpage.php?id=4855
Zašto je vaša supruga prestala snimati “Izgubljene”?
- Dosadili su joj Havaji. Dobila je ono što glumci iz te serije u šali zovu “otočka groznica”: jednostavno, više nije mogla biti na tom otoku, koliko god on bio lijep, nije joj se više dalo raditi taj posao i dogovorila se s producentima da ubiju njen lik.
Kako su je ubili?
- Upucali su je. No, kako je njezin lik dosta popularan među fanovima serije, ostavili su otvorenu mogućnost da se vrati sljedeće sezone.
This part is important.
I'll translate:
Why did your wife stopped shooting ''Lost?''?
She got bored of Hawaii. She got ''island fever'' - that's how cast of Lost calls it in joke. Simply, she didn't want to be on that island, she didn't want to work that job, so she made a deal with the producers to kill her character off.
How did they kill her off?
Shot her. But, her character is pretty popular with fans of the series, so they leaved possibility for comeback next season.