Batman Incorporated# 2: Morrison focused on Talia on this issue and she's given a "new" origin...although I'm not sure what exactly is new about it. We see Talia as a young girl for the first time I think, and that Ra's apparently met her mother at Live Aide in London then shunned her many years later and claimed she was dead.
It's Woodstock. This is the original origin for how Ra's and Talia's mother met according to Denny O'Neil. The only differences are that 1) Morrison's Ra's was already batshit insane and evil and 2) she helped raise Talia according to O'Neil's origin and was killed by one of Ra's men gone rogue.