Christine is too good of a character to quit the scene like that. Me thinks this isn't the last we've seen of her. Look how Avenatti keeps popping back in. One moment, Graham is getting the stare down from Kelly at NoName's funeral, the next he is giving a Mr. Smith goes to Washington speech in the halls of congress.
RR is on the out… but boom he's still on his feet. McCabe is fired, and he comes back to drop a letter in the New York times.
What makes a movie good?
Great actors?
A hell of a script doesn't hurt either. And so far, every character once introduced, stays in play. I think Christine is just at the beginning of her 15 minutes.