Wow - Qynh sure zoomed through her levels, even with Kelsey's interference. I love her child hairstyle - is that the same as Dawn's? It is very attractive in her colouring as well. Is she actually an alien, human or a hybrid?
According to her MCCC Logging Report, Qynh is an Alien Hybrid. I don't know if she has any alien powers.
Yes, Qynh has the same hairstyle as Dawn's. Qynh aged up in it and it was too lovely to replace and alleviates "all the brown."
2 thoughts on the irritating habits of Kelsey:
- Is her interference in the children due to her Family-Oriented trait? I'm guessing Thyme, who also has it, has more directed actions within his likes/dislikes and Masa is involved with the childcare. Only a thought - not suggested out of knowledge.
- Is her slowness in harvesting down to either the gardening bot getting in the way or placement of the planters. I've started leaving a gap all around each one rather than adjacent rows. My Sims always seem to want to harvest the next nearest plant - as the crow flies. not route length - so they were going constantly from one row all the way round rather than the next plant along. 
Anyway - just suggestions - I'm sure you've tried multiple things...
I reprogrammed Masa to be Family-Oriented and both Kelsey and Thyme gained the trait through self-discovery.
Even when directed, Kelsey is not always responsive or does something other than what's needed.
Like placing the baby on the playmat instead of changing or feeding it, as the baby requested.
I couldn't get her to help at all with Thyme's Spooky Party goals--I think the game's decided that's how Kelsey is.
As for the garden, I found a great (?) solution. In the morning, I lock Kelsey inside the garden until she's done harvesting.
I've tried it once so far and she finished very quickly, lol.
Toddler Quirks - I find that my Toddlers always get the quirk associated with the first thing they do. So, if Play is the first thing, they'll get Aggressive. If you whisk them off for a bath, they'll get Loves Water. Dance - Loves sounds or Little Singer. My Dorothy set off Wandering immediately after blowing out her candles and got Wanderer.
Further quirks seem more randomly assigned but usually after doing the relevant action.
I haven't tested this theory but that's how it seems to work in my Simverse.
Using MCCC, I once looked at sim's traits at both the Infant and Toddler stages right after their birthday.
I saw that they already had hidden quirk traits, that eventually manifested.
When Night eventually has a child (or two), I'll try this again and share the results. Maybe my memory's faulty, hehe.
Does the James Turner Trait generator give you all the future traits? Is it better than the in-game di-roll?
Here's the link to James Turner's Random Trait Generator:
https://jamesturner.yt/randomtraitsYou can roll for Infant, Toddler, Child, Teen, Adult, or Elder.
There are two things I like about it:
*I can disable specific packs, like when I'm tired of rolling Horse Lover or another trait that appears too often
*Sometimes, the in-game dice doesn't offer enough variety for a particular generation.
I love Qynh's sass - I'd quite like her to stay with the heir... Ah, but...requirements...? I haven't looked into what your next gen needs... 
Night will probably not move out with all three Gen3 kids, but definitely Qynh.
