This is the part I'd like to know more about. Does she already have the Collection Helper, or did you use the mercury collecting quest?
Carina does have the Collection Helper, but it was mostly the Telescopic Metals adventure that I used. I ignored all the silver and gold, and picked up the Platinum, Mercury, and Plutonium (or Palladium, whatever it is). I just never completed the adventure so the tags were in place for most of the 15 days. I smelted it while in China to avoid any possible deterioration in value while returning home.
Update:Nectarine is working diligently toward her qualification to eat Ambrosia. She has completed her Physical Perfection Lifetime Wish by reaching level 10 in both the Athletic and Martial Arts Skills. She has purchased the supermarket and Crystal Springs, and has done all the necessary upgrades to the property. It's similar to how I did Stoney Falls, except it has a separate adult area with chess and foosball. She has received her three unique Lifetime Rewards: Fertility Treatment (lol), Fireproof Homestead, and the Body Sculptor. At the moment, she's working on the challenges from the Athletic skill journal. She works out in her private locked gym almost every hour that she's not sleeping or fatigued. I'm using the Good Pacing tone so that she can get the most hours out of her workout. I'm not quite ready for her to have a child yet, even though Carina is available for all of the child rearing with her Family Oriented trait. I want her to get closer to her goals first. She has 12 days until she ages to Adult, so there's plenty of time.
Christopher is 90 days old and will die any time now. He still paints and fishes. He's going after Vampire Fish for Carina to feed to the Omni Plants to make more fertilizer for the garden. Kenny, Nectarine's husband, doesn't have very useful traits: Can't Stand Art, Absent Minded, Athletic, Light Sleeper, and I don't remember the last one. His Lifetime Wish is to be a Superstar Athlete. I let him join the Athletic career, but I don't put a lot of effort into him. I'd like to see him reach his LTW so he'll have a larger tombstone, but mostly he's just needed to father the third generation. Indigo has reached level 3 in her Science career. Carina gardens and cooks. My strategy is to keep her as she is without maxing anymore skills or buying anymore Lifetime Rewards. I want to keep as many things open for future generations as possible.
My primary challenge, other than getting Nectarine ready for immortality, is to train up another painter to capture her Adult and Elder portraits. She herself is the next painter after Christopher dies and she can't do a self-portrait. I'll probably have Indigo or Kenny get up to level 5 in Painting just to take care of Nectarine's portraits. Maybe Kenny because he can't stand art. That could be an interesting experiment. Christopher is also the photographer, but it won't be difficult to have someone else take her photograph. I'm keeping an eye out for a better camera at the Consignment Store, too. I haven't planned a sculptor yet. It just hasn't been a priority for me.
Thanks to everyone for reading and commenting!