Greta

Greta is a Nord in the town of Solitude. Upon first entering Solitude she can be found in the crowd to the right gathered to watch Roggvir's (Greta's Brother) execution.

Her daughter, Svari, thinks she should start attending the temple of Talos again. If you speak to Svari, this becomes a quest.

Quests
If you talk to Svari, a child runninng around the streets of Solitude, she will tell you her mother is upset about the death of her bother Roggvir. Upon visiting Greta she will tell you she wants to return but she can't do it without the Amulet of Talos he brother wore. She tasks you with getting it from his body in the catacombs. Once you have retrieved it, return to Greta and she will thank you.

Bugs
Taking the amulet before starting the quest makes it impossible to complete.

Greta doesn't take the amulet or give you a reward, the quest just ends.