McDade, elected to represent Mid Scotland and Fife, said the result showed that voters wanted parties to work together, and that Reform was “open to that”.
“Obviously, many of our aims may not align but many of our aims should be aligning – making Scotland better, getting our economy back on track, balancing private sector enterprise with the public sector,” she told the BBC’s Radio Scotland Breakfast.
“We live in a democracy and people have voted,” McDade said, arguing that it would “play very badly” for other parties if they refused to work with Reform.
“This is childish,” she said, urging party leaders to stop “posturing”.
McDade also claimed that other parties had said “dreadful things” about Reform politicians, potentially increasing the risk to them when in public.
While Holyrood parties rarely have formal co-operation agreements, they are expected to work together in committees and in the chamber to scrutinise, amend and pass legislation.
It is yet to be seen to what extent other parties will refuse to co-operate with Reform, which will have a prominent role in committees and at set-piece events such as First Minister’s Questions.