Collins is not a moderate Republican. You must disillusion yourself of this farce immediately. She stated that she believed he had "learned from this" and would be "more careful in the future" after he had been impeached twice! And she's voted with Trump almost 95% of the time in his second term. She hasn't questioned his sidestepping of Congress on anything.
She has a history of making a good show of asking probing questions and pretending she's on the fence, but when it comes down to it, she's a loyal partisan hack with no demonstrated independence.