According to Amanda's hushmush profile, she's 43, so she's probably born in 1970.
Amanda's Phone # in GTA V
Amanda has a plain Sentinel, not a Sentinel XS.
Almost certain, given her car registration, that she was the former winner of 
Does anyone know what her name was BEFORE it was Townley, and then De Santa? I don't think it's mentioned anywhere in game, but I don't know for sure. TeddyBearZRule (talk) 13:54, April 20, 2014 (UTC)
Her Personal Car
I tried using Franklin to take all the cars to Los Santos Customs, including Amanda's KRYST4L, the car did not retain the modifications. only Michael's and Franklin and Trevor's did, Franklin's bike did also, but Amanda's simply respawned without all the upgrades.