Origin
Sophie began at one point to work for The KGB and became familiar with Burt.
Creation
Sophie was created by Christopher Priest (A.K.A. Jim Owsley) and Mark Bright for Spider-Man vs. Wolverine #1.
Major Story Arcs
High Tide
Sophie and Burt became undercover agents in Hell’s Kitchen but were killed by Charlemagne. Spider-Man later found their dead bodies.