"We could go back with only one, but then one of us will be time-slid and I think we have had quite enough of that." She puts the necklace on.
And she gets to work on packing, since this won't take that long.
"Tomorrow when my mana's all back we will go and not be time-slid at all."
"See if anybody else wants a necklace, make as many as there's demand for. Put together another one of those lectures, probably, I've got enough material. Write down everything I can remember that I haven't already written down from my plane, because it's not going to feel fresh and recent forever. Invent more magic items."
"I want a launderer. I'm tired of having to prestidigitate my clothes clean. And I want a crystal ball and a scriber although I'm sure that will take ages. I am told people will want to communicate with their loved ones who didn't come to Valinor, too, so I want something for long distance communication."
And in the morning they have breakfast and do last-minute packing and say goodbye to the permanent Tol Eressëa residents and say that if any of them want the bungalow it's theirs, and then she goes "oof" scooping up Fëanáro and both of their sets of belongings and away she flies.
"Has it occurred to you that if you think your parents don't like you and that makes you sad, and you don't like them, you might be all three kind of stuck?"
"...I guess that this makes the problem less relevant, if not less troubling. But it might be a while before you can go found your own kingdom."