Does it seem like they are stepping back because they don’t want to part of the treason?

Her constituents and the vast majority of conservatives are sick of her very obvious grudge against Trump. What's also apparent is that Trump conservatism is here to stay, the GOP doesn't have a future outside of that. It's why a Trump endorsement is basically a guaranteed nomination/win in whatever election you're in, and why Romney, Kinzinger, Cheney, Sasse, et al his critics are rightfully losing popularity.

Liz Cheney has made herself a symbol of the neo-conservatism of the W/Dick Cheney era and there aren't many people left who sympathize with that. Anyone who is trying to maintain the Uniparty farce is on their way out, it's just a matter of time.