I wouldn't blame her for not renewing. Katch is right that she's been given nothing really to do this season as the focus is on Blair and her silly issues. Apart from that though, they've pretty much murdered her character too. In the first season she was this kind, loyal, smart and fun-loving character if a bit carefree and misguided now they've just made her this boy-crazy bore :yuckky: blech!
Oh and Anil, there was no way of you knowing that wasn't Blake since that picture's been making its round on tumblr with it being tagged as Blake. I had to do my research when I first saw it a while back because I couldn't remember the photoset it was from and that's how I found out it was actually Katie Cassidy. No worries