Filda is the widow of Teruck of the Smith Caste and mother of Ruck. She is found in the Orzammar Commons found praying to the statue of a Paragon next to a lava flow for her son's safe return.
Involvement
She offers the quest A Mother's Hope to the Warden, where she asks for her son's whereabouts to be investigated.
Result
Once you have found Ruck, regardless of whether you tell Filda Ruck is living or dead, she will offer Ruck's Shield as a reward. However, if you lie to Filda and tell her you looked, but could not find him you will get some gold, but not the shield. If she is told that Ruck still lives she states her intent to go and find him.
If you tell her that you had put Ruck out of his misery (he had gone mad from the taint), she will curse you and there will be no rewards.