If they are good friends then yes she will be in mourning because she most likely knew her (there's also a bug going around that Sims will grieve a sim they barely know.) but a good friend means high relationship so yes she will mourn. They said grief will act like rl so it will take time to heal.
Sure but the dead sim is technically still alive because she has to show up at her job still. I guarantee you when I die I will NOT keep coming to work.
She's a ghost yes but she died so the grief is still there just like my Sims father he died he's a ghost but the Sim still died that's where the grief takes place.
