She's been noticed.
Linus has been calling all of the changes, collectively - because once one or two got overt attention the others were plain as day - "Jovah's hand moving among us".
Isabella is all right with the ship getting credit for her handiwork. It will be more accepted that way. No one riots over the god choosing to peer closely at them if they raise their hands to strike; no one theorizes about the appropriateness of meddling in the natural processes of things like childbirth when they believe Jovah is the active party.
Meanwhile she shadows Delilah. She makes routine visits to Monteverde to talk with Linus about this or that. (She can bring Micaiah, now that they're married.)
She gets steadily more pregnant. The heaviness is no burden to an angel, but it is somewhat physically awkward to be so bulky. She works around it. She's going to have a baby, and she just glows with it.
And, one day, for the first time since before the wedding, she finds Milliways in her and Micaiah's guest room in Monteverde.
"Oh, here it is, I was wondering when it would come by again," Isabella says.
Shell Bell makes an awful face, mostly at her lap but distinctly about Nathaniel, and she mutters, "I'm going to the Belltower," and disappears.
"Do you know what that was about?" Angela asks Sherlock quizzically, putting a hand on Nathaniel's shoulder.
"I... don't know what that was. I'm sorry, Nathaniel, they were being unkind and I have no idea why. It's not like them."
Shell Bell turns her face towards Sherlock's shoulder, and presses it there, and makes a soft noise.
"Did we just run into each other at a bad time? Nathaniel's easily frightened, I wouldn't be surprised if between the two of you you'd managed to give him nightmares."
"Who hides, who wouldn't have gotten away from his father without your help and could've grown up to match like some people do in bad families, who makes me feel like I'm about to start flinging myself onto a bed of coals whenever he talks."
(Hugs, oh, hugs.)
"...I'm not going to ask you to do that, but if that's something my brother-in-law has in him somewhere -"
"If I go look for Voice, what should I do when I find them? If they're a Nathaniel, if they're not...?"