It's humiliating on its own terms: After all this shit, getting free of him, making deals with the universe and Will, buying him that apartment, Peter's still in control. Actually coming after her, through her job, through her rep, through her entire life. Not to mention the fact that marriage has always been the thing that she needed to prove herself about, even among women: As much as a woman can't be lazy, a wife and mother must be less lazy still. Diane never said the second part, but it was always there. A better version of you.
Alicia: "I don't know how to answer that."
Diane: "Well, let me ask you this. If you were assisting me in this decision, how would you advise? Agree to the audit? Or not?"
Say yes, it means nothing. Say yes, it's old debt coming around again. Say yes and your marriage is fine, your family is fine, your job is secure. Say no, protect the firm, and you admit that you're falling apart and that the deal is no good, and that you knew that and couldn't say it. That Alicia's more of a liability at L/G than Cary is at the SA. That Peter won't stop digging until he finds something, and you can't trust Alicia either. That it's personal; that the Good Wife has a Bad Husband. That's she's dead weight, carried up the mountain, dragging them down into the cold.
That's how you rattle her: By suggesting she didn't really earn it, in the end. By suggesting she's been carried.
Alicia: "I would ... Advise you not to."
Diane, sadly: "Okay. You really have a very lovely apartment, Alicia."
There's this in-bred deference Alicia has, to greater rank. She's trying very hard to change.
Mickey shows up, charming and cruel; Eli and Kalinda pass on the pitch altogether.
Mickey: "What the hell is that? Don't you think you could've told me that over the phone?"
Eli, grinning: "I could've. But that would've taken up less of your time."
For the second time in two episodes, Eli reiterates that he doesn't like being used: "You're considering joining a Republican presidential campaign, but the guy's too clean. You can't find a single thing wrong with him. He's too good to be true. And you didn't have the money to vet him, so you hinted that you wanted to hire me so I would vet him for you."
Mickey blusters until they show him a photo we don't see, then admits it -- "Poor Man's Crawfishin'! You let the tourist set the bacon trap and then you go in and raid 'em" -- but Eli calls him a fake bougie and then Eli and Kalinda put him back into the original trap from the beginning of the episode: Mickey works his ass off, gets hired by the guy -- which hasn't happened yet, which he also lies about -- and then hires Eli. That's the only way he gets the info, because apparently they found something after all.