"Require the USG to formally invoke diplomatic and/or consular immunity on behalf of De Sousa and provide her with legal representation with respect to both the criminal and civil proceedings in Italy"
Background information on this convoluted matter can be found here: Woman in Rendition Case Sues for Immunity. There are also detailed stories about the filing in today's Washington Post (Lawsuit seeks diplomatic immunity in Italian case) and New York Times (Woman in Rendition Case Sues for Immunity).
This paragraph from the filing seems to go to the heart of the matter:
42. De Sousa categorically denies having any involvement in the alleged kidnapping of Abu Omar. She also rejects the allegation that she was a principal planner of the alleged operation. Even if the allegations were true, though, her actions clearly fell within the scope of her official duties and thereby entitle her to diplomatic/consular immunity.
In other words, "I didn't do it, and, even if I did do it, I am entitled to skate away free because I had immunity at the time I did it (not that I'm saying I did it)." Actually, I think that argument is fair enough.