But the transition is not going to happen within days.
"There is going to be a delay," she said. "Just logistically, printing, despatching, getting them up, it is going to take a bit of time. It could be a couple of weeks."
She confirmed that deputy leader Kelvin Davis would be number two on the party list as required under the constitution - the Te Tai Tokerau MP along with the other five Maori electorate MPs had previously elected to stay off the list.
"We don't have time to be playing with the constitution right now," Ardern said.
She said she had not yet discussed Little's role or list place with him but said at her first press conference she wanted him to on the front bench (in Labour that is the top 12) and she wanted him in any Labour cabinet.
"I don't expect there to be many changes at all to the line-up of the senior Labour team."
She had nothing to report on the 72-hour stock-take of policies and campaign approach she foreshadowed after being elected on Tuesday. But it may involve enhancements to its student policy.
"It certainly is an area where I've heard from students on the ground that they are really concerned about their ability to meet their cost of living," she said.
"That's an area I want to have a little look at but nothing specific right now."
Among her full schedule on day two in the job was to meet a group of students at Parliament, prompting questions about whether she could replicate the so-called "youth-quake" in the British elections.
"I'm not going to put that level of expectation on myself. Others might," she said.
"But ...if I can turn out even a handful more of young people who might not otherwise have shown up, I'll be pleased with that. I'm not putting a number on that though and I'm not raising expectation."