That's fucked up. A haka should be taken very seriously. She used a haka to make the statement specifically to utilize the most powerful tool available to convey the message. It's a traditional form of communication of the people she represents. She was doing her job in the best way possible. They clearly missed the entire point, since they are treating it the same as "yelling", as if it was a childish reactionary response, instead of a carefully considered and measured response.
The beauty of it all is that the actual step back for the treaty happened in the resource management act changes, while everyone was focused on the treaty principles bill.
Thanks for letting me know. I'm not from NZ but I met some Maori years ago doing a tour and thought that they were really cool and awesome people. So even though I'm not from around there or directly affected I still like showing support when I can.