The Liberal Party is "rightfully going through a process internally" following its catastrophic result at the May election, Senator Bridget McKenzie said.
"They're all seeking to redefine the Menzies legacy for modern Australia, and that's something they've got to do and I wish them all the best for it," she told Nine's Today program on Thursday.
"The idea that there's a federal LNP on the way isn't the answer."
But disaffected Liberals were welcome to join the Nationals.
"If anybody across parliament shares our values, we'll always welcome them with open arms," Senator McKenzie said.
Former Queensland Premier Annastacia Palaszczuk - who returned Labor to power in 2015 after one term of an LNP government which held 78 of the state's 89 parliament seats - urged the coalition to get its house in order and become a policy-developing opposition.
"The election was ages ago and this is doing nothing for Sussan Ley's leadership.
"They should be giving her a go," Ms Palaszczuk told Today.
Celebrating the Liberal Party's 81st birthday, Opposition Leader Sussan Ley urged defeated and divided colleagues to reconnect with voters, reassert their values and develop new policies, months on from its worst ever election showing.
The manifesto took a few shots at the government for what Ms Ley deemed "lower living standards", a home ownership "lottery" and $1.2 trillion in debt.
But she conceded her party had lost touch with Australians, highlighted by an election shellacking that saw Labor surge to a 94-seat majority.
"We didn't lose because of our values, we lost because we failed to heed them," Ms Ley said.
"The values of the Liberal Party are not for changing, we must re-adopt them."
Referencing former prime minister Robert Menzies' famed "forgotten people" speech, Ms Ley said Australia risked developing a "forgotten generation" if her party can't wrest back power.
Ms Ley's statement came after Liberal Senator James Paterson said it was time to stop the election defeat "apology tour".
"People aren't going to vote for us at the next election in two-and-a-half years' time because we've spent a lot of time apologising for our failings," he told ABC radio on Wednesday.
The Liberals' post-election recovery has been hurt by infighting that included shadow cabinet dumping Senator Jacinta Nampijinpa Price, followed by the resignation of MP Andrew Hastie.
Ms Ley's personal polling is also less than ideal.
Recent survey figures from Resolve showed just 33 per cent of voters rated Ms Ley's performance as good or very good, down from 41 per cent in September.
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