That's not much of a loss based on her performance last time around.
To myself and many people I know, Green and non-Green supporters alike, she was the clear winner of the 2008 debates. She often comes off as the only one capable of mature, constructive discussion of issues and offering creative solutions, rather than repeating buzzwords, partisan rhetoric and bickering with the other leaders.
I don't vote Green, but I'm very disappointed she's being excluded this time and will be signing any petition I can find. With 8-ish% of the popular vote, regardless of whether they have any seats, this is an affront to democracy.