Marjorie Taylor Greene and her far-right, antisemitic, qanon proclivities are symptomatic of the direction the GOP has taken.
The evidence isn't based on her being elected in some deep red district or that she's been assigned committee seats (which is degenerate enough).
The evidence of the GOP's slide as personified by MTG is that there's been next to zero pushback to her prancing around with literal Nazis or her utter bats#!tf#&%ery. She's been accepted because she's fam now. And yet dyed in the wool conservatives like Cheney or Kinzinger are now considered complete outcasts within the party. That's the future of the Republican Party come to fruition.
Saying "well she's not Speaker of the House or GOP chair" dodges the point and is intended obfuscate the OP unsurprising.