Unkillable sim

@SnowyChoco 

Is this a sim you yourself created or was born in game? Some premade Sims can not age like Baby Ariel.

@SnowyChoco  I think it might be the hidden traits like Weirdo and Repair, that keeps them from death. You could remove those with cheats, but the cheats are not supported, so it is up to you.

Edit: Here is a list of cheats at Carl's and Pamelas Sims Forum, I think that could be safe to link to. It contains the removal cheat as well. You'll find info more to the point if you seach for it though.
https://www.carls-sims-4-guide.com/traits/cheats.php

Nope, i did not created her. She's a random sim walking outside my house. My sims befriended her and eventually she married into my house.

I tried the cheats removed like "traits.remove_trait isCityRepair", she's still undead.

So, there isn't any solution to age up or make her death? I really wish to move my focus to her descendants.

@SnowyChoco Can you try to remove the other server sim traits as well that you mentioned? Busker and Weirdo. I am not sure about the nanny one, I don't think the trait met nanny as opposed to be nanny matters.

Oh, and log out and reload is a good practice to reset things in game after you have done something to change it. What is the sims original name?

@SnowyChoco 

Please post the Sims name.

I have seen some hidden traits that might cause the problem, while having "testingcheats true" and controlling her, I have done:

• traits.remove_trait isWeirdo
• traits.remove_trait isCityRepair
• traits.remove_trait isStatueBusker
• traits.remove_trait HasMetNanny
• traits.remove_trait isNanny
• traits.remove_trait DetectiveCareer_Criminal

Well, she's still in a hysterical mood, watching comedy shows for sim hours and not dying.

Her name is Alex Moyer, I don't think I ever changed her name.

@SnowyChoco Alex Moyer is immortal I think, connected to the tutorial. I deleted her in Manage View. I think MCCC can disable immortality, I do not have that mod so I don't know how far that feature goes.

Edit: I deleted Alex Moyer first thing when starting my save; I do not know what could happen when a sim that has been played with is deleted.

@SnowyChoco That was excellent! I will try to remember it.
What a way to go! I hope she gets a fitting eulogy.

Not sure the information below helps or not, but my previously undead sim has these issues:

• Age bar is frozen, no age-up option on birthday cake too
• Harvestables (tomatoes, onions, apples...) can't be dragged out from her inventory. Potions and upgrade parts work fine

If someone has the issues above, probably is the same issue as mine. Hope this information help.