Thanks all! She was definitely in a played household, and I think it must be a bug. She was probably meant meat to die, culling would not wait for or them to die, right?
Anyway, even if there is a tech limit to how many sims a save can handle, I find it kind of strange that the game would not at least give a warning - "hey simmer, we refuse to tell you the exact limit of sims in this game, but you are getting close...". What if culling was a thing due to hidden limit, and I added a new pack with a bunch of 20 new premade sims? Should the game cull 20 of my old played sims to make room? I doubt it.
I might keep looking for her gravestone, but at this time I just see it as a story - her son is frustrated because she wandered a lot in her last year and did not always remember where she lived. So, if anyone see her urn, pls call ... ;)
