She appreciates that even though it's clearly mostly just a way of saying 'we'll talk for as long as you're interesting'. Or until a team of people working for her are able to use the mirror as a Teleport location. 

"Let's get far far away," she writes on a note and passes it to Cam. 

"We dropped some things at the Worldwound. Care packages, nice clothes, spellsilver. We were going to keep doing that, and make it clear that it's an apsel doing it, aimed at supply lines adequate to close the thing."

"Why the Worldwound?"

Cam starts heading for the Moon.

It's like being back in school. On the other hand, she was very good at school. On the other other hand, the woman presumably knows that, and picked this tactic with that in mind -

She can say the obvious bits, at least. "He's Chaotic Good and it had to be something we'd agree on. It'll mean there are powerful people invested in our remaining alive, even if they'd certainly prefer we weren't operating independently. It serves Cheliax but not in a way where anyone could publicly oppose it just on those grounds, and I think the churches fighting the Worldwound'll be handicapped in opposing it even secretly. It'll take a while, so it buys time to arrange various contingencies. It will prevent the world being eaten by demons, which I'm in favor of, because I'm Lawful, and also live here."

"It might work for a little while. It won't work for very long."

"I'm not going to tell you my backup plans but I do have them."

"I could be one of them, and arrange to raise you."

"I think I could arrange that elsewhere at a lower price."

"Is there a backup plan for your apsel?"

"That I think you can't afford."

"Obviously, summoning one with the same circle you used has been tried; equally obviously, it didn't work. I doubt you started with more idea than them how to reproduce it, and they've had smarter people working full time on it, so you haven't deduced it yourself. So maybe the apsel himself knows, or maybe it can't be replicated. In the case where the apsel knows, you might have more of them already, for bodyguards, or you might've decided against that because vetting and compensating them all is outside your capabilities, or you might not have been able to convince him to tell you; he benefits in some ways from his scarcity."

Or she might not have a scalable mind control solution or she might not trust the bindings Cam would give her if she asked for that.

"If it can't be replicated, then it's far more important to keep you alive, so that might be the impression you'd prefer to foster. On the other hand, if it can't be replicated than if you are killed there's less motivation to resurrect you."

"If I die all of this will be known to Cheliax," Carissa says blandly. 

"Known to Hell. It's somewhat different. If I were you, I'd be on another plane, and I'd have some magicless recruit disguised to look like me make all the trips to the Worldwound, and possibly have this conversation, though I do respect your decision to have it yourself; you learn less, in some ways, from merely listening in and passing notes. If you've done that, the likely point of failure is that your apsel, as you observed, is Chaotic Good."

"We have had a little bit of banter about the inevitability of our eventual betrayal."

"Go be Chaotic Good, darling. Cheliax can live without your allegiance more easily than without your alliance."

What.

"Oh, grow up. It won't kick you out of Hell, and if it did we'd pick you up again eventually, and you have just declared yourself certified, fled the country, and decided to singlehandedly fix the Worldwound with mountains of presents, you are clearly capable of picking up the spirit. Do you serve Asmodeus?"

"Yes!"

"Do you really think that your alignment, or for that matter your ultimate fate, features meaningfully among Asmodeus's concerns here?"

"We work with the allies we are handed, Sevar."

This is probably advice to lie more convincingly to Cam. Taken as that it's good advice. 

She nods. Slowly. "I, uh, I don't think I really know how to be chaotic good."

"Well, what kind of terrible person do you find most personally annoying."