That isn't true.
She was a vocal critic of the Democrat's climate plan and subsequent legislation over the course of the past year and a half. She has always opposed anything which even hints at limiting greenhouse gases. Her voting record reveals someone who is inflexible. There is a reason that Liz Cheney chaired the House Republican Conference, the third highest position in the House Republican leadership from 2019 to 2021, before coming out so forcefully against Donald Trump's conduct after 1/6.
Republicans new favorite study trashes Biden's climate plans – but who's behind it?
When it comes to matters of policy :
If it involved deregulation, she was all for it.
If it involved a ban or restriction, she was adamantly opposed to it.
... and there is no such thing as compromise with her.
^^^ This ^^^ made her a darling of the right, before 1/6. To pretend otherwise, is either ignorant or dishonest. The one and only reason she fell out of favor within the Republican Party was her high profile opposition to Donald Trump. That is why the GOP is now a cult of personality.
They have only one litmus test for party membership now = An unconditional devotion towards, and a passionate defense of anything having to do with Donald Trump.