Literally the most complicated search and rescue operation I've ever been a part of.
I FOUND HER!
I had to go into the oldest saved game I had.
NRASS find graves for Alesha (daughter) and Albert (husband of Ada).
Using my Witch Sim, I cast reanimation spell on both Alesha (daughter) and Albert (husband) graves.
Once Alesha and Albert were added to my household using NRASS, I could search their family trees
Alesha > NRASS > Basic > Family Tree > Ada Vest > Invite Over
Ada showed up as an elder age 119 days! I tried to NRASS add to family, but she disappeared!!
I tried again. She came over as a ghost!!
NRASS add to family and she disappeared again!!
One more time. I got her over, had one of my household members make friends with her - had to use Friend potion.
Made friends with Ada ghost until she FINALLY appeared on friends list.
Took some time, made friends, asked her to move in.
Ada ghost moved in
Edit in testingcheats CAS in order to save to bin
Cheated age to Young Adult - she was pretty old and about to die. Didn't want to lose the ghost too!
Unable to save to bin because she's a mermaid!
Made her human, saved to bin
NOW!!!! I can go into my current game and move her in.
Holy cow. That was exhausting. All this for a character I don't even care about. LOL. Ada was indeed a homeless Sim and did not exist on any of the demographics in NRASS. The only place she existed was in the family tree of Alesha and Albert. It turns out, Ada is the EX-WIFE of Albert, which is why they didn't have any connections. To top it off, being a homeless mermaid about to die, it put her in some netherworld. But, with a lot of time and effort, I managed to recover a very difficult to find Sim. Yay me. LOL.