She dismissed claims by National that Deputy Prime Minister and NZ First leader Winston Peters, who filled in for her when she was on parental leave, was still acting like he was the Prime Minister.
"That is the kind of thing that Opposition are going to say. Its the kind of thing I'm going to simply shrug off."
She said she had not "told off" Peters for undermining the coalition Government.
Much has been made in recent days of the differing views of Labour and New Zealand First on various policies, including the refugee quota, the three strikes law, and proposed changes to industrial law.
Peters, who filled in for Ardern on Newstalk ZB yesterday, said media reports of cracks looming in the coalition Government were "balderdash".
"This is the first real MMP government and consultation and communication are what we do. There'll always be things that are called a work in progress.
"You had the coalition agreement, then you had the 100-day statement, then you had the Speech from the Throne, then the Budget. If those things we're talking about are not in those four documents then they are always work in progress," Peters said.
Peters denied that differing views aired in public were evidence of friction between Labour and NZ First.
"You're making a mountain out of a communications molehill.
"We are forced by MMP circumstances to always think about being in a coalition government, and if it's not agreed upon then it'll be a work in progress."