The Tories have been seen as unlikely budget partners for Labour, but Millar wrote to Morgan on Tuesday offering talks as a “responsible opposition”.
Plaid Cymru has not closed the door on talking to the government, but the party’s leader, Rhun ap Iorwerth, has said, “it’s Labour’s budget”.
On Tuesday his finance spokesperson Heledd Fychan said Labour had “clearly run out of steam… they’re not putting forward a budget that shows ambition for Wales”.
A spokesperson for Dodds said she recognised what was at stake for public services.
“That means Jane is ready to listen and work with other parties, something that neither the Conservatives nor Plaid Cymru were willing to do in the last budget,” they said.
Reform, which has one MS after the defection of Laura Ann Jones, said it would not support a budget that continues to fund the Nation of Sanctuary policy.