Mrs Reid said Ms MacGregor was a "problem" in running a provincial campaign, with too much focus on Mr Craig.
"She was very controlling, and it kind of hamstrung our campaign, in what we could do.
"When we wanted to issue a press release, or speak about a certain issue, we weren't allowed to say much."
This included "moral crusades" the pair would have like to tackle, but were told they were off-limits.
"It was all about Colin. Brent found it frustrating."
Issuing of press releases had to be via the press secretary, resulting in delays that made them look like they were running a catch-up campaign.
She believes there remains a strong network of "conservative" people in the provinces, but the provincial campaigners ran into similar problems as her and Mr Reid.
"We ran a campaign here, in Wairarapa, at our own expense, a considerable monetary outlay, considerable time taken up.
"We did our very best, in representing the ideals that we believe in. "My husband is a blue collar worker.
"For us to put our money where our heart is, we don't do that lightly."
She said Mr Craig's behaviour had let down the party.
She said his discussion on whether he believed in the moon landings "and the photographs in the grass" - a series of reclining publicity shots - "weren't helpful".
"It's very sad, because there's a lot of good people, good conservatively-minded people, now without a leader of integrity. We wanted to speak out because we asked the public to back us.
"I don't see how the party can come back from this."
