The Republicans don't have to let her in their caucus. She can be forced to caucus with her left and right buttocks for that matter, or go play ball with Hairy Reed.
Fur shur she's not reliable enough a vote for the Republicans to tolerate her.
You can't do that with all the RINO's. Lose Murkowski, Snowe, Collins, Brown, Kirk, and just two more (possibly Graham, Alexander, Corker, Cochran, McCain, take your pick) and the Democrats can do whatever they want again.
The Democrats still can do what they want, but they can’t get it through the House! You cut off the RINOs and idiots NOW, and that’ll take all their seniority rights away.