The leader of the WA Nationals Party has denied suggestions she or her branch were involved in a conspiracy to bring down former deputy prime minister Barnaby Joyce.

The WA Nationals Party have launched an internal review of how allegations of misconduct by Mr Joyce levelled by a former WA Rural Woman of the Year, Catherine Marriott, became public.

The internal document, obtained by the ABC, reveals former WA Nationals leader Terry Redman alerted WA state Nationals president James Hayward on February 17 that a further "avalanche of allegations" was expected to be made by a group of regional women against Mr Joyce.

Mr Joyce has previously denied allegations of misconduct and described the suggestion of up to 10 potential complainants as "patently absurd", slamming the allegations as "spurious and defamatory".

Mr Joyce stepped down on February 23 as deputy prime minister and Nationals leader, after facing sustained pressure to quit following revelations of his affair with former staffer Vikki Campion, who is pregnant with his child.

WA Nationals Leader Mia Davies was one of the first party figures to say she had lost confidence in Mr Joyce's leadership.

Conspiracy theories 'ridiculous': Davies

However Ms Davies today told ABC Radio the idea she or her party members had tried to "concoct" a plan that would lead to Mr Joyce standing down was "ridiculous".

Sorry, this video has expired 'It sickens me': WA Nationals Leader Mia Davies angry about media naming Joyce accuser

"The notion that there was any conspiracy or discussion or any premeditated discussion around trying to get her (Ms Marriott) to make that complaint, or for us to concoct something that would lead to Barnaby Joyce stepping down, is ridiculous," Ms Davies said.

"It's malicious, and it makes it all the more difficult for women like Catherine to come forward and have their complaints dealt with seriously."

Ms Davies said she and Mr Redman had received a complaint from Ms Marriot, and referred it to the federal Nationals president Larry Anthony.

When asked why she did not at that point refer the complaint to police, Ms Davies said it was the express wish of Ms Marriott that it was dealt with internally by the party.

Catherine Marriott has accused Barnaby Joyce of sexual misconduct. ( Tom Edwards )

However she declined to comment on whether she was aware of any other allegations by other women against the embattled former leader.

"This type of discussion in a public forum makes it very difficult for people to come forward," Ms Davies said.

"If you don't feel like your complaint is going to be taken seriously, if you don't feel like the organisation is going to respond appropriately, it does make it difficult and I don't want to be a part of a culture that makes that more challenging."

'Not a witch hunt'

Mr Hayward in an interview on ABC Radio Perth declined to comment on whether Mr Redman made a call to inform him of the potential of future allegations.

However, he said he was not aware of any other specific complaints.

"Nothing's been raised with me and again, if people have complaints they ought to raise them," Mr Hayward said.

"What is important is that we as a party make sure we have a process in place that is robust and fair and organised so that all of our people know how to deal with these things."

He also distanced himself from some of his comments in the report, saying he believed Ms Davies and Mr Redman did very well in making sure the complaint "got where it needed to go".

"I would never had written it like that if I knew it was going to be put into the public domain, and I'm very disappointed it has," he said.

"This is not a witch hunt, this is not about saying 'Oh look, the leaders of our party didn't do very well'," Mr Heyward said.

"What I've written in my critique, my report, is harsh. It's black and white.

"Was that the best decision, well in terms of what the complainant's wishes were, it may not have been, that's what I've raised.

"But this is an untested report, it hasn't even gone to the state executive yet to be considered. Now there may be other factors that I am completely unaware of."

Asked if Mr Hayward continued to enjoy her support, Ms Davies avoided the question twice, choosing to stress that she had the full support of her colleagues and party.