Silver was born in 2255. Now aged 22, she was a prostitute who worked for Colin Moriarty in Megaton before they had a falling out. She ran away with her share of her earnings (or so she says) and is hiding out in Springvale, just outside of Vault 101. Silver is now a pitiful psychojunkie and lives her life in constant fear of reprisal from Moriarty. Her name is a reference to her very light blond, almost silvery hair.
Following in His Footsteps, 300 Pieces of Silver: Moriarty will ask the Lone Wanderer to kill her in return for information about their dad. The choice is to either really kill her, get a varying amount of caps from Silver to pay her debt, or tell Moriarty she is gone without taking any caps from her (which will earn good Karma). Upon her death she will have 100 bottle caps if the Wanderer offered to tell Moriarty she is gone with no reward or 400 bottle caps otherwise.
PCPlaystation 3Xbox 360 If one agrees to tell Moriarty she is gone before talking to Moriarty, he may spawn into an inaccessible area; see his own article for tips on fixing the problem on the PC version (console players cannot fix the problem). [verified]
Xbox 360 Sometimes when the Wanderer meets Silver for the first time she interacts as though they have already met making the quest "300 Pieces of Silver" impossible to do or start. [verified]
Xbox 360 If the Lone Wanderer fails the speech check for the 500 caps, they can do it again, which will result in a passed speech check.[verification overdue]
↑First name taken from G.E.C.K., AI package (FreeformMegatonSaraSilverSandbox)