She has zero impact on this matter.
Nothing can happen without the filibuster avoidance maneuver and that is not going to happen regardless of her vote.
She is campaigning for re-election. She deserves no blame in this matter because her position was to have no influence on the entire matter.
Applaud her. No other Republican could hold that seat and regardless of all other votes, she will vote for a GOP Majority Leader, if she is elected and the GOP holds its majority.
The bill is too important to give up.
Your right
They only need 50 votes. Vance will be tie breaker. With a so called “ Standing Filibuster” you only need a simple majority.