NEW YORK—Prosecutors hope to preserve a July trial date for Ghislaine Maxwell by defending a late-hour expansion of charges against her, saying they developed when a woman spoke after Maxwell’s arrest about her abuse at the hands of Jeffrey Epstein in the early 2000s. The rewritten indictment lodged against the 59-year-old British socialite on March 29 added sex trafficking charges to allegations that Maxwell recruited three teenage girls from 1994 to 1997 for then-boyfriend Jeffrey Epstein to sexually abuse. New charges stretched the conspiracy to 2004. Two days after the superseding indictment was returned in Manhattan federal court, defense attorney Bobbi Sternheim called it “shocking, unfair, and an abuse of power,” saying the charges were based on evidence prosecutors had in their possession for years. “That the government has made this move late in the game—with trial set for July 12th—is obvious tactical gamesmanship,” Sternheim wrote in a letter to …