I have no idea why alien hybrids don't show alien skin tones, but it seems wrong to count them based only on MCCC's categorization of their life state, lol.
RE: Timing, my first priority is keeping Yae continuously pregnant so she won't age. Regarding the children, if I find their teen birthdays falling on Saturday, I start having wish for better grades at every cooldown, hehe.
It doesn't happen that often, though. I especially don't want to deal with vampire teens over the weekend. I had to keep the Scotts locked indoors during daylight, except for school.
Yae's aspirations aren't considered part of the challenge, so I haven't listed them anywhere. More important than the aspirations are the reward traits she buys with her extra satisfaction.
She's Fertile, Beguiling, Professional, Never Weary, Always Full, and Forever Fresh plus has Free Services, Steel Bladder...you get the picture. *winks
But you are correct: Yae's running out of eligible aspirations.