There would also be growing pressure on the government’s spending plans over the parliament, Miller added.
“Spending plans look extremely tight. They don’t look to me like plans that this government would want to deliver,” she said.
“Whether or not they are delivered matters because the spending plans underpin the plan to bring down borrowing,” she added.
Miller said she was left with the impression that Healey was hoping the economy would improve to take the pressure off those spending decisions.
Healey, speaking on the BBC’s Today Programme, said “economic storms”, including the Iran war and Russia’s invasion of Ukraine, were affecting countries around the world and the government was seeking to help where it could.
He said energy bill help would create “breathing space” for most households.
Around 20 million households are set to receive the £100 payment based on which council tax band they are in.
But Conservative shadow chancellor Andrew Griffith said the Budget had left the public finances “more fragile” as Healey had reduced the “headroom” or the buffer that the country has between what it takes in revenues and what it spends.
Liberal Democrat leader Ed Davey said the £100 energy payment would be identified as the best item in the Budget for many people, but said that it was “not good enough” when you considered the “stealth tax rises” that were taking money out of people’s pay packets.