Noelle herself doesn't express much of an opinion; making her situation less of a problem and her safer to be around would be worth it whatever side effects if comes with.
"If the power is largely passive, it would be safer to have a fully general restriction that expires at some later time. Geases can be fuzzy around involuntary or compulsory actions. How about never touching or attacking anyone at all unless the power is to her own best judgment, or one of yours, no longer a problem? If there are things that aggravate the involuntary parts of your power, you can include an clause not to let them aggravate you. It might help. I can loosen or remove a geas easily if you change your mind, by the way."
"How does the not being aggravated clause work?" the blonde Traveler asks. "She has to avoid those things, or they magically don't affect her, or they affect her less depending on how much choice she has in it?"
"I'm not entirely sure how it will work with otherworldly powers, but it mostly helps you not care about the things that are aggravating you. It takes away, automates, most of the mental effort. When I geas addicts not to crave their sin of choice, they still crave it, but they find it easier to dismiss or ignore the craving because they are not allowed to let it affect them. It only helps so much, but some is more than none."
"Do it," comes Noelle's voice, piped in remotely. "I need all the help I can get with ignoring this...craving."
Repeat after me: I swear that I will not touch or attack another person until such time as my power is no longer harmful, to my own best judgment. While this oath is binding I will consider actions on my part that may be attacks, as attacks. While this oath is binding I will not allow the cravings or impulses caused by my power to affect me. While this oath is binding I will not allow involuntary responses to break this oath in whole or in part. So mote it be."
"...in whole or in part. So mote it be."
Everyone here is in very much in favor of moteness.
"Is there a safe way to test if it worked, or do we have to have someone come here and see if it got easier for me to resist?"
Oliver comes out safely. He waits a few minutes, talking with Noelle at a normal volume and with the lights on. Noelle reports that the feeling she's about to attack someone is at a normal intensity, and it doesn't feel more controllable. But she's resisting as much as she ever could, and isn't having to concentrate to do it.
"It seems like that's the best I can do. You've already paid, so I'll be on my way. Unless you have more questions?"
Noelle, meanwhile, just thanks her repeatedly from across the radio.
She leaves.
And the Travelers have just made more progress than their entire cape career. Next up, anyone on their list who can remove powers directly, or is Noelle picking between repeated transformations to reset its progress and a curse?
There's nobody who can directly remove powers. Transformations and curses are both options, though.
Noelle wants a transformation. Badly. Even if there's nothing better than the Witch who could turn people into animals, that's infinitely better than this. And they're rich; they can have it undone later if the curse is a total success.
Of the Witches who can transform people (and who are not currently on probation, insane, and/or in prison) the nearest one can turn people into animals and lives in the southern half of Hispania, which is Gimel's version of Spain. It's a three-day boat ride, or a rather expensive ten-hour airlift by Witch couriers.
Is there a transformer who can turn Noelle into her real self? That would be worth lengthening the trip.
Getting there with Noelle would be five days by boat then two and a half days by train. Places' prices are much lower for in-world teleports, but still fairly high. There are two other teleporters in London if they want to shop around, but both of them are employed by the UDF so it might make secrecy complicated.
And Krouse can try to bargain the price down to normal in-world teleport level, since the trip is much less dangerous this time.
She'll do it for normal in-world teleport level (A few thousand dollars - Noelle is still huge if not quite so dangerous anymore) if they tell her everything they know about Cauldron.
They don't know much. No one does. They can confirm that Cauldron exists and sells bottles of superpowers. They've personally seen a set, though they weren't Cauldron customers, and the people who drank the vials ended up with powers. They recommend not talking about it much; the rumor says that Cauldron is very good at finding out when their secrecy is threatened.
They don't tell Places that they got their abilities from those vials, or that drinking half of one is the cause of the problem they're trying to solve.
Arranging for a place for Noelle to stay close to this healer only takes another couple of days. Places suggests that they say Noelle is already the victim of a curse, to help avoid inconvenient questions.
As long as it doesn't mislead the healer in a way that would interfere with fixing the problem, they'll go along with it. Noelle can have been cursed to absorb any organic matter and spit out evil clones if that's a thing curses might do.