I've always wondered why Silver hasn't been mentioned since Bruce's "death", since she was one of the few civilians who knew Bruce was Batman and should know the current Batman is not Bruce (Dick and Bruce being different body types and Dick using various opportunities to get his Batman caught on camera).
Having said that I realize she was a girlfriend du jour for the writer, just as Talia was O'Neil, Sasha Bourdeux for Rucka and Jezebel Jet for Morrison. One of the reasons the Selina/Bruce idea has lasted so long I think is because her relationship with Bruce is not tied to one particular writer.