If Jaylin is in your treasury, I think the only thing you need to do is go to the beach at Amaranthe, leave, and come back. I'm not sure whether you have to leave the island or just the beach, so I'd suggest leaving the island to be safe. If that doesn't work, check the version you are playing; that scene was just added with the 2019.06.11 release.Well that answers the Mai and Dea question so cheers for that seriously.
And I cannot think what scene I might have missed. I just found Jaylin and reuinited her with her
daughter and she's moved in and taken over my treasure horde. But I cannot make her appear at
the beach house at all. I went to that exact spot, got nothing. Only thing Jaylin says to me is 'It's
a beautiful view' then 'Don't touch any of my gold'.
Jaylin leaves the beach after its over, you should be able to see it in the gallery. You can also check switch 544 (Jay-Kay beach threesome, on if you've already seen the scene).