Danielle Greaves (Strangetown)

Danielle Greaves is one of the many Sims buried in Olive Specter's lot, judging by her suit, she previously worked as a Pizza Delivery Woman. She was also the first Sim to die on Olive's lot. and she died when Olive was a toddler (you have to check Olive's memories to see this)

I think she was killed by Olive Specter because the pizza was cold when Danielle arrived, so Olive killed her, on the other hand, there is another situation, that Danielle brang the pizza and saw that Olive killed another sim( like Lyla or a maid, or Rigger, Ichabod) when Olive realized that Danielle saw her she has decided to kill her.