Mr Harawira quit the party in February over its relationship with the Government and is now the independent MP for Te Tai Tokerau.
The hui was called to discuss putting up a candidate against him, either in the by-election he is threatening to hold or at the November 26 general election.
Party president Pem Bird told NZPA Mrs Harawira tried to disrupt the hui.
"She chose to interject, talk over the top of or sing over the top of anybody who was speaking," he said.
"It didn't stop at all, we continued with our meeting with all this going on in the background."
Mr Bird said Mrs Harawira called delegates "snakes, and a whole lot of other things".
"We were very disappointed, and that would be an understatement, by her treatment of (party co-leader) Tariana Turia," he said.
"She publicly called her a liar, and other comments about our relationship with National were very uncomplimentary.
"It was pretty colourful language, you could say."
Mr Bird said some people left the hui in disgust, and elders who arranged it had apologised for the disruption Mrs Harawira and another person, believed to be one of her daughters, had caused.
Mr Bird said the hui, called by the Maori Party's supporters in Te Tai Tokerau, decided to quickly rebuild its branch infrastructure which fell apart after Mr Harawira left.
"They want to re-establish the infrastructure, under their control," he said.
"They want to do that quickly, and they want to have a choice in terms of standing a candidate.
"It's really important to them, they believe they will be denied a choice if they are denied having a candidate."
A second hui would be held in Auckland tonight, where there would be further discussion about putting up a candidate, he said.
"We can't see any reason why not...but we have to debrief the party leadership and talk about it," he said.
When Mr Harawira left the Maori Party there was an agreement between the two sides that neither would stand candidates against the other.
There was also an agreement that neither would criticise the other, and the Maori Party says Mr Harawira has breached that by repeatedly insulting its leaders.
It considers the whole deal is off and that it is free to stand against Mr Harawira if it wants to.
Mr Harawira had said he was going to resign from Parliament and force a by-election but now says he needs to talk to his supporters before making a final decision.
A by-election would cost $500,000 to run and would be held close to the general election.
National and Labour have described it as a waste of money and a political stunt, and National has said it wouldn't contest it.
