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Collins told Mike Hosking on Newstalk ZB that she didn't believe the numbers in the poll and that it contradicted positive feedback she was getting.
The Newshub-Reid Research poll comes after weeks of National accusing the Government of having a "separatism by stealth" agenda.
She said it was also the first poll to be run since the election "so it was normal for the opposition leader to take a fall months after an election".
"And we are just getting going on things - getting focused on the things that matter."
Anecdotally, people were telling her they thought National was doing the right thing and standing up to the Government, particularly on their "secret agenda and the radical interpretation of the Treaty of Waitangi", she said.
She also pointed to an increase in the number of people attending regional National party meetings and said they "really liked the fact that we are holding the Government to account".
Collins was pleased to see there was a "little bit" of an increase in support for the National Party.
People were coming up to her and saying please make sure you stay, she said.
"I am safe."
Her comments come after the poll showed Labour at 52.7 percent (up 2.7 percentage points from election night), and National at 27 percent (up 1.4 percentage points).
In the preferred PM stakes, Jacinda Ardern polled at 48.1 percent (down 4.5 percentage points), while Collins was at 5.6 percent (down 12.8 percentage points).
Former PM John Key was higher than Collins on 6.7 percent, while backbench National MP Christopher Luxon was on 2.4 percent.
The latest numbers mean that Labour could govern alone comfortably.
The Newshub-Reid Research poll is its first of the year, and follows a One News Colmar Brunton poll in March that had Labour on 49 percent, National on 27 percent, the Greens on 9 percent and Act on 8 percent.
This was a slightly narrower gap between the major parties than on election night in 2020, when Labour won 50 percent of the vote and National won 25.6 percent.