No such luck for me after fighting her half a dozen times.

The chances have been noticeably better since version 2.0 hit. I've gotten Solveig, Stephanie, Rumiko, Lola, Miss Spook, and Sylvia to drop since then. But I'm still missing Sung Tai Ki (world 3), Housemaid (world 4), Kelina (world 6), Leeditt (world 7), Marina (world 8), and of course all three world 9 girls.