Fastest way to get Temperance?

She appears every 5 nights in a haunted house, or sometimes on the more difficult Paranormal Investigator gigs.

She's in my unplayed households. You can probably just move her in.

A playable sim could become a Temperance, Guildry or Bonehilda by using the Trait codes.

Spending a few nights in a haunted house will spawn Temperance eventually, but flirting with Temperance is not easy, just standing near her will give your sim a very high scared moodlet. So you need to have a bunch of positive moodlets on your sim that prevents your sim from being scared. The brave reward trait could probably help but that one is expensive to buy.

Sorry, I just post to brag (but I think the others have already answered the OP question):

https://i.imgur.com/H3h0lE2.png

https://i.imgur.com/P3vDIKV.png