The panel was expected to provide recommendations for the next three years and the 2023 campaign.
A draft report was expected by the end of January next year, and a final report a year later.
"There is no doubt 2020 was a difficult year for the National Party and we would be foolish not to comprehensively review every aspect of our approach to the campaign, and our work throughout the last term of Parliament."
Confirmation of the details of the review follow the party's annual general meeting on the weekend, at which former PM Sir John Key gave a blistering speech about the problems the party had got itself into, saying its election result could be put firmly at its own door. He told the MPs to stop leaking or leave the party.
The party was beset by problems after Covid-19 arrived in New Zealand from March – changing its leader from Simon Bridges to Todd Muller after panic about a dive in its polling over the lockdown period. After Muller stood down, Judith Collins stepped in as leader.
A slew of its highest-profile MPs also resigned during that period, including Paula Bennett, Amy Adams and Nikki Kaye, while other MPs resigned after getting into troubles such as Hamish Walker and Andrew Falloon.
Kirk oversaw the last such review after the 2002 election, and led big changes to the party's constitution, including creating the board model it now operates under.
She was helped by Steven Joyce, who was appointed general secretary.